Primary and Secondary Heirs: Their Shares

Islamic inheritance law employs a sophisticated system for categorizing heirs and determining their shares that has been elaborated by scholars over fourteen centuries into one of the most technically refined disciplines in all of Islamic jurisprudence. Understanding the basic framework of this system is essential for any Muslim who wishes to distribute their estate in accordance with divine guidance or to understand their own rights in the estate of a deceased family member.

The heirs in Islamic inheritance law are divided into several categories based on the source of their entitlement. The first and most important category consists of the Quranic heirs (ashab al-fara'id) — those whose specific fractional shares are designated in the Quran. These include: the husband (who receives one-half of his wife's estate if she had no children, or one-quarter if she had children), the wife (who receives one-quarter of her husband's estate if he had no children, or one-eighth if he had children), the daughter (who receives one-half if sole, or two-thirds collectively if multiple daughters with no son), the father (who receives one-sixth as a fixed share if the deceased had children, but becomes a residuary heir if the deceased had no children), the mother (who receives one-third in the absence of children, or one-sixth in their presence), and full sisters (under specific conditions).

The second major category consists of the asabat — the residuary heirs, who receive whatever remains of the estate after the Quranic heirs have received their fixed shares. The primary residuary heir is the deceased's son, who takes the entirety of the residue (or receives double the share of any daughter alongside him). The son's descendants, the father and his ascendants, and various other male agnatic relatives form the broader circle of residuary heirs, arranged in a precise order of priority.

The third category includes heirs related to the deceased through female links only (dhawul-arham) — such as the daughter's children, the mother's siblings, and others — who inherit only in the absence of both Quranic heirs and residuary heirs.

The principle of hajb — blocking or exclusion — governs the relationship between different categories of heirs: a closer heir blocks a more distant one from inheriting. For example, a son blocks the grandson from inheriting; the father blocks the grandfather; the full brother blocks the half-brother from the father's side. This principle, which operates with considerable complexity in actual estates, ensures that the closest relatives of the deceased take priority over more distant ones.

Siddiqi provides worked examples throughout his analysis to illustrate how these rules apply in practice. Consider a man who dies leaving a wife, a son, and a daughter: the wife receives one-eighth (her Quranic share when children are present), and the remaining seven-eighths are divided among the son and daughter in the ratio of two to one — so the son receives twice the daughter's share of the residue. Or consider a woman who dies leaving a husband and two daughters: the husband receives one-quarter (his share when children are present), the two daughters collectively receive two-thirds, and the remaining portion (one-quarter minus two-thirds, which is negative in simple addition) is addressed through the mechanism of 'awl — proportional reduction — which will be explained in the subsequent chapter.

The shares designated for women in the Islamic inheritance system — which are typically half those of men in the same category — require contextual understanding to appreciate their wisdom and justice. In the Islamic financial system, women have no mandatory financial obligations: they are not required to support spouses, children, parents, or other relatives from their personal wealth. Their inheritance — however smaller than the corresponding male share — is entirely their own. The male heir who receives a double share is simultaneously burdened with the obligation to maintain his wife and children from his own estate. When the full picture of Islamic financial obligations and entitlements is considered together, the wisdom of the designated shares becomes apparent.