Son's Share in Islamic Inheritance
The Son as Asabah: No Fixed Fraction
Unlike wives, daughters, parents, and uterine siblings (all of whom receive specific fixed fractions prescribed in the Quran), a son has no fixed fractional share. Instead, a son is classified as Asabah bi nafsihi: a residuary heir by himself. This means a son takes whatever remains of the estate after all fixed shares have been distributed. If there are no fixed-share heirs at all, the son takes the entire estate.
The Quranic basis is Surah An-Nisa 4:11: "For the male is a share equal to that of two females." This verse establishes the 2:1 ratio when sons and daughters coexist, but the son's share is not stated as a fraction; it is defined by reference to the daughters' portion.
Son as the Only Heir
When a son is the sole heir with no fixed-share heirs present, he takes the entire estate as pure Asabah. If there are multiple sons and no daughters or other heirs, they divide the residue equally. There is no primogeniture (eldest son does not receive more) in Islamic inheritance law. Each son receives an identical share.
Son with Daughters: The 2:1 Ratio (Ta'sib bil Ghair)
When a son inherits alongside daughters, a crucial mechanism called Ta'sib bil Ghair (making others residuary heirs through oneself) applies. The presence of a son converts the daughters from fixed-share heirs (who would otherwise receive 1/2 or 2/3) into Asabah heirs alongside him. The entire residue is then distributed in a 2:1 ratio: each son receives twice what each daughter receives.
| Heirs | Distribution | Example (R 600,000 estate) |
|---|---|---|
| 1 son, 1 daughter | Son 2/3, Daughter 1/3 | Son R 400,000, Daughter R 200,000 |
| 1 son, 2 daughters | Son 2/4, each daughter 1/4 | Son R 300,000, each daughter R 150,000 |
| 2 sons, 1 daughter | Each son 2/5, daughter 1/5 | Each son R 240,000, daughter R 120,000 |
| 2 sons, 2 daughters | Each son 2/6, each daughter 1/6 | Each son R 200,000, each daughter R 100,000 |
How a Son Affects Other Heirs' Fixed Shares
The presence of a son (a "child") reduces several fixed shares. This is called Hajb Nuqsan (reduction rather than complete exclusion):
- Husband: reduced from 1/2 to 1/4
- Wife/wives: reduced from 1/4 (shared) to 1/8 (shared)
- Mother: reduced from 1/3 to 1/6
- Father: moves from pure Asabah to 1/6 fixed + residue (if any remains after daughters)
Heirs Blocked by the Son: Hajb Hirman
A son does not merely reduce some shares. He completely excludes certain heirs altogether. This is Hajb Hirman (total exclusion):
- Grandsons (son's son): completely blocked. The son's son only inherits when no living son exists.
- Full brothers: completely blocked by a son.
- Paternal half-brothers: completely blocked.
- Full sisters (as Asabah): blocked from taking residue, though they may still take their fixed 1/2 or 2/3 if the son scenario involves only daughters as co-heirs; but a son converts them to Asabah participants.
- Nephews (brothers' sons): completely blocked.
- Uncles (father's brothers): completely blocked.
Son vs Grandson: Why Grandsons Are Blocked
A common question in estate planning is: if a son died before the deceased, does the son's son (grandson) step into the father's place? Under Islamic inheritance law, the answer depends on whether any other sons survive. A grandson is completely blocked by a living son: there is no "representation" principle (unlike some civil law systems where a predeceased child's share passes to their children). If one son survives, the grandson through a different predeceased son receives nothing from the Faraid distribution.
This is why estate planning (particularly writing a Wasiyyah) is critical for Muslim families where some children have predeceased the parent but left their own children behind.
Worked Example: Estate with Sons, Daughters, Wife, and Parents
Estate: R 1,200,000. Deceased: male. Heirs: 2 wives, 2 sons, 3 daughters, father, mother.
| Heir | Rule | Share | Amount |
|---|---|---|---|
| Wives (2) | With children → 1/8 shared | 1/8 total | R 150,000 (R 75,000 each) |
| Father | Children present → 1/6 fixed | 1/6 | R 200,000 |
| Mother | Children present → 1/6 | 1/6 | R 200,000 |
| Residue | 1 - 1/8 - 1/6 - 1/6 = 13/24 | 13/24 | R 650,000 |
| Father (residue) | Father is Asabah after 1/6 fixed; but sons present so father gets 1/6 only | — | — |
| 2 sons + 3 daughters (Ta'sib) | 2:1 ratio, 7 parts: sons 2+2, daughters 1+1+1 | R 650,000 / 7 | Each son R 185,714; each daughter R 92,857 |
Calculate an Estate With Sons
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Calculate Now →Son's Share: All Scenarios at a Glance
| Heirs present alongside son | Son's share | Notes |
|---|---|---|
| Son only (no other heirs) | Entire estate | Sole residuary heir |
| Son + wife | Remainder after wife's 1/8 | Wife's share reduces from 1/4 to 1/8 when son present |
| Son + daughter(s) | 2 parts for every 1 part each daughter receives | 2:1 ratio (Ta'sib bil Ghair) |
| Son + father | Remainder after father's 1/6 | Father gets fixed 1/6; son takes residue |
| Son + both parents + wife | Remainder after wife 1/8, father 1/6, mother 1/6 | Son takes residue, typically around 58% in this configuration |
| Multiple sons | Residue divided equally between all sons | All sons share the residue in equal portions |
| Sons from different wives | Equal shares regardless of which mother | Maternal identity does not affect Faraid shares |
Sons from Multiple Marriages
When a man with multiple wives dies, his sons from different wives all inherit equally from the same estate. The identity of each son's mother has no effect on Faraid. A son from a first wife and a son from a second wife are treated identically: they share the residue in equal portions after all fixed shares are assigned.
Similarly, a son whose mother has already died, a son from a dissolved marriage, and a son from a current marriage are all treated equally. Faraid tracks biological parentage through the father, not marital status or maternal relationship.
Worked Example: Sons and Daughters Together
The deceased leaves a wife, two sons, three daughters, and both parents. Net estate: R1,200,000.
| Heir | Share | Amount (R) |
|---|---|---|
| Wife | 1/8 (children present) | 150,000 |
| Father | 1/6 (children present) | 200,000 |
| Mother | 1/6 (children present) | 200,000 |
| Residue for children: R1,200,000 − R550,000 = R650,000 Units: 2 sons × 2 units = 4 units; 3 daughters × 1 unit = 3 units; Total: 7 units | 650,000 | |
| Each son | 2/7 of residue | 185,714 |
| Each daughter | 1/7 of residue | 92,857 |
| Total | 1,200,000 | |