Joint Hindu Family — Concept, Karta, Coparcenary

A joint Hindu family is the natural state of a Hindu household — a body of all persons lineally descended from a common ancestor, plus their wives and unmarried daughters, living jointly in food, worship, and estate. A Mitakshara coparcenary sits inside it as a smaller, sharper body — the sub-set of family members who acquire by birth an interest in the joint property and who alone can compel partition. The two are not synonyms. Confusing them is the single most common error in Hindu Law answers, and the favourite trap of judiciary papers on this subject.

The chapter unpacks three things together: the joint Hindu family as a legal phenomenon (its membership, presumption of jointness, classification of property); the coparcenary as the property-holding sub-body (the four-degree rule, the post-2005 inclusion of daughters, the sole-surviving coparcener); and the Karta as the family's manager (his powers, the limits the Privy Council placed on his alienations, his duties, and the post-Sujata Sharma position that a daughter too can be Karta). Section 6 of the Hindu Succession Act, 1956 — substituted by the 2005 Amendment — sits at the centre of the modern law and must be read with Vineeta Sharma v. Rakesh Sharma (2020).

The joint Hindu family — concept and membership

The joint Hindu family is wider than the coparcenary. It comprises every person lineally descended from a common ancestor, together with the wives and unmarried daughters of those descendants. There is no upper limit on the number of members nor on their remoteness from the common ancestor; one is added to the family by birth, marriage, or adoption. A wife who enters by marriage — typically under the Hindu Marriage Act, 1955 — becomes a sapinda of her husband; a daughter, on her marriage, ceases to be a member of her father's family and becomes a member of her husband's. The membership category itself maps onto the statutory definition of who is a Hindu for the codified Acts. Even an illegitimate son is a member, and a widowed daughter is entitled to maintenance from the family.

The family is not a corporation; it has no juristic personality distinct from its members. It is represented in dealings with the outside world by its Karta. The unit is a creature of Hindu personal law, not of contract — which is why it cannot be created by agreement, and a so-called "composite family" formed by pooling of resources between unrelated households (most often noticed in Andhra Pradesh) is a creature of custom, not coparcenary.

Presumption of jointness

Hindu law starts with a presumption of jointness. Every Hindu family is presumed to be living in a state of union unless the contrary is proved, and the burden of proving disruption falls on the party who alleges it. The presumption is stronger where the relationship is closer (father and son) and weaker as the relationship moves outwards (cousins, lateral branches). Modern living arrangements — members residing or working in different cities — do not, by themselves, displace the presumption; jointness in food, worship, and estate is what matters, not physical co-residence.

What does not follow from the presumption of jointness is a presumption that the family owns joint property. Existence of a joint family is one fact; existence of joint family property is another. As the Supreme Court reiterated in D.S. Lakshmaiah v. L. Balasubramanyam (2003), a person asserting that any specific item of property is joint family property bears the burden of proving it. The shortcut is the nucleus rule: once the existence of a sufficient nucleus of joint family property is established, any acquisition standing in the name of any member is presumed to be joint family property, and the burden shifts to the member claiming it as self-acquired to prove that he bought it from his own funds. A nucleus that is too small to have funded the acquisition does not trigger the presumption.

Reoti Devi and the proof of reunion

The companion proposition — that once a family separates, reunion has to be proved by clear evidence of an express or implied agreement to come back together — is the holding in Bhagwan Dayal v. Reoti Devi, AIR 1962 SC 287. There, K had set up a business at Agra from his self-acquisitions and brought his nephews into the venture, even purchasing some properties in joint names. The Supreme Court held that these facts did not amount to a reunion of the previously separated family. Reunion is a doctrine; mere joint working or pooling of effort is not. The case is also frequently cited for the proposition that severance of status can be unilateral, but reunion cannot — it must be bilateral, deliberate, and clearly proved.

Mitakshara and Dayabhaga — the school distinction

Hindu law divides historically into two schools, and the rules of joint family and inheritance take very different shapes in each. The Mitakshara school applies to the whole of India except Bengal and Assam; the Dayabhaga applies in Bengal and Assam alone. The differences are best mapped to four lines of doctrine that recur in every chapter on coparcenary, partition, and succession — and that the schools-of-Hindu-law chapter sets out at length.

1. Right by birth. Under Mitakshara, the son acquires an interest in ancestral property the moment he is born — the doctrine of janmaswatva. Under Dayabhaga, the son acquires no interest while the father is alive; he takes only on the father's death.
2. Survivorship. Under Mitakshara, the share of a deceased coparcener passes to the surviving coparceners by survivorship — historically. Under Dayabhaga, succession is the mode; survivorship has no place. (Section 6(3) HSA after 2005 has now abolished survivorship for all Mitakshara families too — a significant convergence with the Dayabhaga model.)
3. Quantum of share. Mitakshara coparcenary is fluctuating: each coparcener's share enlarges with deaths and diminishes with births in the family. Dayabhaga shares are defined; each coparcener can predicate his fraction.
4. Power of disposal. Under Dayabhaga, a coparcener can alienate his defined share by sale, gift, or will, even during the joint state. Under Mitakshara, no coparcener can alienate his undivided interest by gift, and only with consent of all (or by virtue of statutory enablements such as Section 30 HSA for testamentary disposition) can he alienate it by other modes.

The chapter that follows is concerned overwhelmingly with the Mitakshara joint family — which is the operative model across India for almost all states.

Mitakshara coparcenary — what it is, and the four-degree rule

A Mitakshara coparcenary is a narrower body than the joint family. It consists of those persons who acquire by birth an interest in the property of the holder for the time being, and who can therefore compel partition of that property. It begins with a common ancestor — the holder of joint property — and includes only those descendants who are not removed from him by more than three degrees. Hence the textbook formulation: a son, grandson, and great-grandson are coparceners with the holder; the great-great-grandson is not, because he is in the fourth degree of descent from the holder. The instant the holder dies and the chain shifts upward, the next-generation male becomes a coparcener — "the upper links are constantly removed by death; fresh links are continually being added by birth".

The Supreme Court in State Bank of India v. Ghamandi Ram, AIR 1969 SC 1330, set out the canonical six incidents of Mitakshara coparcenary:

Three of those six incidents have now been heavily altered by the 2005 Amendment — survivorship in particular — but the architecture remains the starting point. Coparcenary ownership is co-ownership with unity of possession: no individual coparcener can say while the family is undivided that he has a definite share. As Lord Westbury put it in Appovier v. Rama (1866), no individual member can predicate of the joint and undivided property that he has a definite interest. The interest fluctuates. It crystallises only when a coparcener communicates an intention to separate, or when a partition is decreed.

Daughter as coparcener — the post-2005 position

The Hindu Succession (Amendment) Act, 2005 substituted Section 6 of the principal Act with effect from 9 September 2005. The substituted Section 6 reads:

Sub-section (3) abolishes the rule of survivorship: when a Hindu dies after the commencement of the Amendment, his interest in the Mitakshara joint family property devolves by testamentary or intestate succession (and not by survivorship), and the coparcenary property is deemed to have been divided as if a partition had taken place. The daughter takes the same share as a son.

The interpretive question — is the new Section 6 retrospective, prospective, or retroactive — was finally resolved by a three-judge Bench in Vineeta Sharma v. Rakesh Sharma (2020) 9 SCC 1. The Court held that the daughter's right is a right by birth; it does not depend on whether the father was alive on 9 September 2005. Prakash v. Phulavati (2016) — which had held that both daughter and father had to be alive on the cut-off date — was overruled to that extent. The substituted Section 6 confers coparcener status on the daughter from her birth (subject to the proviso that alienations and partitions completed before 20 December 2004 are not disturbed). For more on the 2005 Amendment generally, see the chapter on the devolution of interest in coparcenary property under Section 6; for the leading case in detail, see daughter's right in coparcenary after Vineeta Sharma.

The four-degree limit continues to apply on the male side. A great-great-grandson is still not a coparcener with the living great-great-grandfather; the chain still moves up only when an upper link dies. The Amendment expanded the body to include daughters by birth; it did not abolish the depth limit.

Categories of property — joint, separate, blended

The classical division is between joint family property and separate property. Within the first, two further sub-categories matter for the exam.

Ancestral / coparcenary property

Property inherited by a male Hindu from his father, paternal grandfather, or paternal great-grandfather is ancestral property — the classical "unobstructed heritage" (apratibandh daya). The descendants of the holder acquire an interest in it by birth, without any obstruction. Property inherited from any other relation — a maternal grandfather, a brother, a collateral, a female relative — is not ancestral. The Privy Council in Mohd. Hussain Khan v. Babu Kishva (AIR 1937 PC 233) held that property inherited by the father from his maternal grandfather is not ancestral in the son's hands. The category has narrowed further after Commissioner of Wealth Tax v. Chander Sen (1986) 3 SCC 567: where a son inherits separate property from his father under Section 8 HSA, that property is the son's separate property and not joint family property in his hands.

The label of obstructed heritage (sapratibandh daya) describes property in which the right to take accrues only on the death of the last owner — the typical separate property of a male, in which the heirs have no birth-right. The two categories together explain the coparcenary scheme: only unobstructed heritage runs the survivorship-and-birthright system; obstructed heritage devolves by succession.

Self-acquired and other separate property

Self-acquired property is what a Hindu earns through his own labour, learning, or skill, without detriment to joint family funds. The Hindu Gains of Learning Act, 1930 settled an old controversy — gains made by a member through his learning are his exclusive property, even if the joint family financed his education. Property purchased from a junior member's separate income, salary earned without nexus to family funds, gifts of love and affection from a non-coparcener, property received under a will from a stranger, prize-money, accident compensation, and recovered lost property without aid of family funds — these are separate property. Income from separate property is also separate, unless it has been thrown into the common stock.

Accretions

Accumulations or additions to coparcenary property — purchases made out of joint family income, exchanges, or property obtained in lieu of joint family property — generally retain the character of coparcenary property. The label is descriptive: the new asset partakes of the source.

Doctrine of blending

A coparcener may voluntarily throw his self-acquired property into the joint family hotchpot, with the intention of abandoning his separate claim in it. Once thrown in, the property loses its self-acquired character and becomes joint family property. The doctrine, however, is strict on intention. Mere mixing is not blending; nor is permitting other family members to use the property; nor is utilising the income from a separate item for the support of the family out of generosity or affection. As the Supreme Court held in Mallesappa Bandeppa Desai v. Desai Mallappa, AIR 1961 SC 1268, the act of generosity or kindness will not ordinarily be considered as an admission of a legal obligation; the coparcener's intention to waive his separate right must be discoverable from his words or from his acts and conduct. The basic notion of blending is the wider sharing of one's own property by permitting fellow members the privilege of common ownership. A female who is not a coparcener cannot blend her separate property with joint family property — there is nothing in her hands to blend.

For blending to operate, an existing coparcenary into which the property is thrown must exist; existence of a coparcenary is essential. No formality is required. A specific pleading is not strictly necessary, though desirable. Once thrown in, the property cannot be taken out again at the coparcener's option.

Karta — the manager of the joint family

The Karta is the manager of the joint Hindu family — its representative in dealings with the outside world, the convenor of its expenditure, the contracting party in family business, and the alienor (within strict limits) of joint family property. The default rule is that the senior-most member of the family is the Karta. Under traditional law, this meant the senior-most male. After the 2005 Amendment placed the daughter on equal footing with the son, the Delhi High Court in Sujata Sharma v. Manu Gupta, 226 (2016) DLT 647, held that there is no impediment in law to a female acting as Karta — if a daughter is the senior-most member of her father's family, she is entitled to manage the family's affairs as Karta. The reasoning is structural: once the daughter is a coparcener "in the same manner as the son", every incident of coparcenary that runs with seniority — including the Kartaship — must run with her. The same conclusion follows from a plain reading of substituted Section 6(1).

A junior member can act as Karta only with the consent of the senior member; the consent must be proved by cogent evidence. The position is sui generis — the Karta is not an agent, not a manager in the commercial sense, not a trustee. He represents the family but he is not accountable for past income and expenditure in the absence of fraud, mismanagement, or a partition suit. Two persons can manage particular affairs, but there cannot be two Kartas of the same family; in joint family business, however, more than one member may have authority to bind the family.

Powers of the Karta

The Karta's day-to-day powers are wide. He receives all income from family sources; he spends on maintenance, education, marriage, and religious obligations; he runs the family business (with wider borrowing powers if it is a trading family); he refers family disputes to arbitration; he enters into compromises that operate as res judicata if made bona fide; he acknowledges debts and pays interest so that limitation runs afresh (though he cannot acknowledge a time-barred debt under Section 25(3) of the Contract Act); and he sues and is sued on behalf of the family.

The single most important power — the one that the exam papers test, the one on which the case-law mountain has been built — is the power of alienation. The Karta can alienate joint family immovable property only in three recognised circumstances: (i) legal necessity (aapatkale), (ii) benefit of the estate (kutumbarthe), and (iii) indispensable duties of a religious or moral character (dharmarthe). Outside these three, an alienation by the Karta is voidable at the instance of the non-alienating coparceners. The framework was laid down by the Privy Council in Hunoomanpersaud Panday v. Mussumat Babooee Munraj Koonweree (1856) 6 MIA 393 — universally cited as Hanooman Persaud — and continues to govern alienations under the codified law.

Legal necessity is read in a wide and modernised sense — it covers performance of marriage and other necessary sanskaras, subsistence and education of family members, payment of family debts and government dues, defending a family member in litigation, the medical expenses of the Karta when family income falls short. Benefit of the estate was earlier read narrowly (limited to defensive transactions); the Supreme Court in Balmukund v. Kamlawati, AIR 1964 SC 1385, accepted a wider reading — a transaction that a prudent owner would enter into for the protection or productive enhancement of the estate qualifies, but a bare expectation of profit does not. Indispensable duties covers obsequies, marriage of coparceners, religious gifts of small portions of immovable property to a daughter or sister for pious purposes, and gifts of love and affection from movable property.

The burden of proving legal necessity or benefit of estate lies on the alienee, not on the challenging coparcener. Recitals of necessity in the sale deed are not enough by themselves; they may corroborate other evidence. The alienee must show either the actual existence of necessity, or that he made bona fide enquiries and was satisfied that necessity existed. An alienation made without necessity is voidable, not void; the non-alienating coparceners may have it set aside, and the limitation period is twelve years from the date of dispossession under Article 109 of the Limitation Act.

Limits on the Karta — gifts, dispossession, accountability

The power of gift by the Karta is much narrower than the power of sale or mortgage. Of joint family movable property, the Karta may make small gifts of affection — to a son, a daughter, a wife, on customary occasions like marriage, upanayana, or birth. Of joint family immovable property, the Karta has no general power to gift; only a small portion can be gifted to a daughter or sister for a pious purpose. A gift of joint family immovable property to the wife is generally not upheld; a gift to a concubine is void. A gift of the whole, or even a substantial part, of the immovable estate by the Karta is bad in law — the Mitakshara father, even, has no such power.

The Karta is not liable to render past accounts in the absence of fraud, misappropriation, or a suit for partition; once a partition is sought, he is bound to account from the date of filing. A coparcener who is dissatisfied with the Karta's management cannot have him removed; he can only ask for partition. The Punjab and Haryana High Court in Jujhar Singh v. Gian Talok Singh, AIR 1987 P&H 24, refused a permanent injunction restraining a Karta from a future alienation — the alternative remedy of challenge after sale being adequate. The Supreme Court in Sunil Kumar v. Ram Parkash (1988) 2 SCC 77, however, kept the door open for an injunction in cases of waste or ouster.

Coparcener's interest — what the coparcener can do

A coparcener — male or, post-2005, female — has the following interests:

1. Right by birth. The coparcener acquires a fluctuating interest in coparcenary property the moment he is born (or, in the case of a daughter, from the operation of substituted Section 6).
2. Right to demand partition. Any major coparcener may at any time call for a partition by metes and bounds. He need not show cause. The act of demanding partition severs his status from that moment, even before the property is physically divided. The detail belongs to the chapter on partition — modes, reopening, and reunion.
3. Right to maintenance. Every coparcener, and indeed every member of the joint family, is entitled to be maintained out of family property. Wives and unmarried daughters too are entitled to residence and maintenance. The detailed rules sit in the chapter on maintenance under Hindu law, which works closely with the statutory regime in Sections 18–22 of the Hindu Adoptions and Maintenance Act, 1956.
4. Right to challenge unauthorised alienations. A coparcener may sue to set aside an alienation by the Karta that is unsupported by legal necessity, benefit of the estate, or indispensable duty.
5. Right to dispose of his interest by will. Section 30 HSA permits a Mitakshara coparcener to dispose of his undivided interest by testamentary disposition. The mechanics of will-making for a Hindu sit in the chapter on testamentary succession among Hindus. Inter-vivos alienation by gift remains barred (except where all coparceners consent).
6. Liability for ancestor's debts under the doctrine of pious obligation. Under traditional Hindu law, a son was liable to discharge the personal debts of his father out of joint family property to the extent of his coparcenary interest, provided the debt was not contracted for an illegal or immoral purpose (avyavaharika). Section 6(4) of the substituted HSA prospectively abolished this liability for debts contracted on or after 9 September 2005:

The doctrine of pious obligation thus survives only for pre-2005 debts. The full architecture is treated in the chapter on the pious obligation doctrine — pre and post-2005.

Hindu Undivided Family — the tax dimension

Section 2(31)(ii) of the Income-tax Act, 1961 includes a Hindu Undivided Family within the definition of "person" — making it a separate assessable entity. The Income-tax Act does not define HUF; the term is used in the same sense as it is understood under Hindu personal law, and the Mitakshara coparcenary supplies the substantive content. Two cases anchor the HUF jurisprudence:

In Surjit Lal Chhabda v. CIT, AIR 1976 SC 109, the Supreme Court held that an HUF can exist for income-tax purposes even where the assessee is the sole male coparcener, provided there are other family members (wife, daughter) entitled to maintenance. A coparcenary in the strict sense is not the indispensable condition for an HUF; the joint family character is. The decision is the basis of the rule that a single male coparcener with his wife and unmarried daughter constitutes an HUF.

In C. Krishna Prasad v. CIT, AIR 1975 SC 498, an unmarried male, on partition, did not himself constitute an HUF in the absence of any other member; the property in his hands was assessable as his individual income. The line, drawn together, is that an HUF requires more than one member in actual existence. A child in the womb cannot be counted; a sister or brother who is not a member of the family unit cannot be counted.

The contrast is also instructive: when joint family property comes into the hands of the sole surviving coparcener, the income is still assessed in his hands as Karta of the undivided family (and not as his individual income) — but if he, having no son and no daughter post-2005, dies, the property passes by succession, not by survivorship.

Sole-surviving coparcener

A sole-surviving coparcener arises when every other coparcener of the family has died (or has separated by partition). In his hands, the joint family property loses its coparcenary character and becomes, for most purposes, his separate property. He may sell, mortgage, gift, or bequeath it without showing legal necessity or benefit of estate. The character is not, however, lost forever. The moment a son is born to him, the property reverts to coparcenary character and the new-born son acquires an interest in it by birth. The same now follows for a daughter under Section 6(1) read with Vineeta Sharma.

Two qualifications matter. First, a son who was in the womb at the time of an alienation by the sole-surviving coparcener can challenge it after birth — a child en ventre sa mere is treated as in existence for purposes of partition and alienation. Second, the share that a coparcener obtains on partition is ancestral property qua his male issue but separate property qua his other relations; on his death, having no son, it passes by succession (not by survivorship) — distinguishing the partitioned-share situation from the sole-surviving-coparcener situation.

MCQ angle and exam pointers

The recurring testable distinctions on this chapter:

• Joint family vs coparcenary. Joint family is wider — wives and unmarried daughters are members. Coparcenary is narrower — only those with birthright.
• Four-degree rule. Three degrees of male descent from the holder; the great-great-grandson is outside while the holder is alive. Daughters are coparceners by birth post-2005, but the depth limit on the male side continues.
• Vineeta Sharma. Daughter's coparcener status is by birth; the father need not have been alive on 9 September 2005. Prakash v. Phulavati overruled.
• Karta's powers — Hanooman Persaud test. Three grounds — legal necessity, benefit of estate, indispensable duty — and the burden of proving them is on the alienee, not the challenging coparcener. Recitals alone are not enough.
• Daughter as Karta. Sujata Sharma v. Manu Gupta (Delhi HC, 2016) — a daughter who is the senior-most member is entitled to be Karta.
• Doctrine of blending. Self-acquired property is thrown into the common stock with intention to abandon separate claim; mere mixing is not blending; Mallesappa Bandeppa Desai is the lead authority. A non-coparcener female cannot blend.
• Pious obligation cut-off. Section 6(4) HSA prospectively abolished the doctrine for debts contracted on or after 9 September 2005. Pre-2005 debts continue to attract it.
• Sole-surviving coparcener. Property is treatable as separate; a subsequent birth restores the coparcenary; en ventre sa mere challenge remains live.
• Mitakshara vs Dayabhaga. Birthright, survivorship, fluctuating shares, restricted alienation — Mitakshara features. Defined shares, succession-only, free alienation by coparcener — Dayabhaga features.

The chapter sits beside several others in this series. For the structural overview of the sources of Hindu law, the school distinction in detail in Mitakshara and Dayabhaga schools, the codified Section 6 mechanics in the Hindu Succession Act, 1956, the female-succession scheme in general rules of succession in the case of females, the pre-2005 male-succession rules in general rules of succession for male Hindus, and women's separate property in stridhan and women's property rights, the present chapter lays the foundation. The procedure of breaking up the joint family — partition — sits in the partition chapter; the post-decree restitution of jointness sits there too.

Conclusion

The joint Hindu family is not a corporate person; the Mitakshara coparcenary is not a partnership; the Karta is not a trustee. Each is a creature of personal law, with its own architecture — the family knit together by sapinda relationships, the coparcenary defined by the four-degree rule and the right by birth, the Karta empowered to manage and (within strict limits) to alienate. The 2005 Amendment did not collapse the coparcenary into a unit of equal succession; it expanded the body to include daughters, abolished survivorship, and set a cut-off for the doctrine of pious obligation. The result is a hybrid: the Mitakshara form continues, but the discriminations against daughters have been excised. Read with Vineeta Sharma, Sujata Sharma, and Hanooman Persaud, the modern law is administrable, and — for examination purposes — comfortably mappable section by section. For consolidated coverage of the leading authorities across the subject, see the chapter on landmark cases.

Frequently asked questions

What is the difference between a joint Hindu family and a Mitakshara coparcenary?

A joint Hindu family is the wider body — every person lineally descended from a common ancestor, plus their wives and unmarried daughters. A Mitakshara coparcenary is the narrower sub-set: only those persons who acquire by birth an interest in the joint family property and who can demand partition. Pre-2005 the coparcenary was confined to four degrees of male descent; post-2005, daughters of coparceners are coparceners by birth too, but the four-degree depth limit on the male side continues. Wives and widowed daughters remain members of the joint family but are not coparceners.

Can a daughter be Karta of a joint Hindu family?

Yes. The Delhi High Court in Sujata Sharma v. Manu Gupta (2016) held that there is no impediment in law to a daughter becoming Karta. Once the substituted Section 6 of the Hindu Succession Act made the daughter a coparcener "in the same manner as the son", every incident of coparcenary that runs with seniority — including the Kartaship — runs with her. If she is the senior-most member of the family on the relevant date, she is the Karta and may exercise every Karta power.

What are the grounds on which a Karta can alienate joint family immovable property?

Three grounds, recognised since the Privy Council decision in Hanooman Persaud v. Babooee (1856): legal necessity (aapatkale), benefit of estate (kutumbarthe), and indispensable duties of a religious or moral character (dharmarthe). The burden of proving any of these lies on the alienee, who must show either actual existence of necessity or bona fide enquiries that satisfied him of its existence. Recitals in the sale deed are not by themselves enough. An alienation outside the three grounds is voidable at the instance of the non-alienating coparceners.

Did Vineeta Sharma make the daughter's coparcener right retrospective?

Vineeta Sharma v. Rakesh Sharma (2020) held that the daughter's coparcener right is a right by birth — it is retroactive, not strictly retrospective. The father need not have been alive on 9 September 2005 for the daughter to claim coparcener status. The earlier ruling in Prakash v. Phulavati (2016) — which had required both daughter and father to be alive on the cut-off — was overruled. The proviso to Section 6(1) saves alienations and partitions completed before 20 December 2004, but otherwise the daughter's birthright is fully effective.

What is the doctrine of blending and what makes it different from mere mixing?

Blending is the voluntary throwing of self-acquired property into the joint family stock by a coparcener with the clear intention of abandoning his separate claim. Mere mixing of the property with the joint estate, or permitting other family members to use it, or supporting them out of its income, does not amount to blending — those are acts of generosity, not legal abandonment. The Supreme Court in Mallesappa Bandeppa Desai v. Desai Mallappa (1961) made the intention element decisive. A female who is not a coparcener cannot blend her separate property with joint family property.

When does property in the hands of a sole-surviving coparcener become coparcenary property again?

When another coparcener comes into existence. The classical example is the birth of a son to the sole-surviving coparcener; the moment the son is born, the property reverts to coparcenary character and the son acquires an interest in it by birth. After 2005 the same follows on the birth of a daughter. While the holder is the only coparcener, he may sell, mortgage, gift, or bequeath the property as if it were his separate property; but a son in utero at the time of the alienation can challenge it after birth, since a child en ventre sa mere is treated as in existence for partition and alienation purposes.