The second Shafi’i distinguishing position held by the matn: in al-Mushtarakah, the full sibling(s) share in the maternal siblings’ 1/3 (tashrik). Plus al-‘Umariyyatain and four cases of uncertainty.
Al-Mushtarakah with tashrik
Composition: husband + mother (or grandmother) + 2+ maternal siblings + a full brother. A straightforward calculation exhausts the base of 6 (husband 3, mother 1, maternal siblings 2) and leaves the full brother with nothing.
This is where the madhhabs part ways — and the Shafi’is choose tashrik, following Umar’s final ruling: the full siblings said, “Suppose our father were a donkey (himar) — isn’t our mother the same?” So the full sibling(s) are folded into the 1/3 together with the maternal siblings, divided equally per head (male = female within this 1/3, because they enter through the maternal line):
flowchart LR
classDef furud fill:#1e3a8a,stroke:#3b82f6,color:#dbeafe
classDef khas fill:#7f1d1d,stroke:#ef4444,color:#fee2e2
classDef hasil fill:#3b0764,stroke:#a855f7,color:#f3e8ff
A["Base of 6"]:::hasil --> S["Husband 1/2 = 3"]:::furud
A --> I["Mother 1/6 = 1"]:::furud
A --> T["1/3 = 2 → DIVIDED EQUALLY<br/>between maternal siblings +<br/>full sibling (TASHRIK)"]:::khas
Worked example: husband + mother + 2 maternal siblings + 1 full brother → 1/3 divided equally among 3 heads → each person gets 2/18 = 1/9. (The version without tashrik — the Hanbali line in the previous two bundles — still leaves the full brother with nothing.) This is one of the most famous cases where the final result depends on the madhhab — always worth flagging when calculating for someone else.
Al-‘Umariyyatain
The same across madhhabs: spouse + mother + father, with no children and no siblings → the mother gets 1/3 of the remainder, so that father : mother stays 2 : 1. With a husband (base of 6): 3-1-2; with a wife (base of 4): 1-1-2.
Four cases of uncertainty
The matn’s principles and its commentaries follow what you already know — certainty first, hold back what’s in doubt:
- Khuntha mushkil (ambiguous-sex heir) — calculate both scenarios; give everyone their smaller share; hold the difference until it’s clarified or settled.
- Mafqud (missing person) — their share is held; the waiting period is left to the judge’s ijtihad.
- Janin (unborn child) — inherits if already conceived at the time of death and born alive; hold the largest scenario.
- Simultaneous death (gharqa/hadma) — with no certainty of order, they do not inherit from each other; each person’s estate goes directly to their own surviving heirs. If the order is known → ordinary inheritance, often leading to munasakhat (chapter 06).
Dzawil arham — a reminder of the matn’s position
Already covered in chapter 07: under the classical Zayd/Shafi’i system they do not inherit (bayt al-mal takes precedence); later Shafi’i scholars (muta’akhkhirin) open the door if bayt al-mal is not well-organized. In the sibling Hanbali bundle, they inherit via tanzil — make sure you know which system you’re calculating with.
Sources: history and map of positions on Mushtarakah: IslamQA 496015; Matn ar-Rahbiyyah + Sharh al-Hazimi (Shamela 11372, 36125); special cases: the final chapters of the matn and its commentaries. Full list in 15-references.