One of the more intricate and often overlooked aspects of Islamic inheritance law is the principle of ḥijb, or exclusion — whereby the presence of certain primary heirs prevents other relatives from receiving a share of the estate. This exclusion is not based on favoritism or social status but on a divine legal logic that prioritizes proximity, responsibility, and rightful claims.

The Principle of Exclusion

In Islamic inheritance, certain heirs are said to be “blocked” or excluded (mahjūb) from receiving any portion of the estate due to the presence of closer or more entitled heirs. The most frequent reason for exclusion is the presence of a direct male descendant — particularly a son. The presence of a son often renders several other relatives ineligible for inheritance, due to the son’s stronger claim and responsibility over the deceased’s lineage.

Who Gets Excluded in the Presence of a Son?

When a son is among the heirs of the deceased, the following categories of relatives are generally excluded:

• The son’s own son (i.e., the grandson)
• Full brothers and sisters
• Half-brothers and sisters (from the father’s side or mother’s side)
• Nephews and nieces
• Paternal uncles and their children
• Various distant agnatic relatives

Altogether, there are thirteen categories of relatives who may be excluded from inheritance when a son is present. For instance, if the deceased has a son, his full brother or even his brother’s son will not inherit. Similarly, his paternal uncle or the uncle’s son will also be blocked.

Exclusion in the Presence of the Father

If the father of the deceased is alive, the grandfather (the father’s father) is excluded. In cases where both the son and the father are present, a full brother is excluded, as is a half-brother through the father.

The maternal half-brother, on the other hand, may be excluded not only by the presence of the son and the father but also by the presence of the daughter or the son’s children (grandchildren).

Representative Table of Excluded Heirs and Those Who Exclude Them

To better understand this structure, let us look at some specific examples:

1. Excluded: Half-Brother through the Father

Excluded by:

• Father
• Son
• Son’s son
• Full brother
• Full sister along with a daughter or granddaughter

2. Excluded: Half-Brother through the Mother

Excluded by:

• Father
• Grandfather
• Son or Daughter
• Grandchildren (through son)

3. Excluded: Son of a Full Brother

Excluded by:

• Father
• Son
• Grandfather
• Grandson
• Full Brother
• Half-Brother through the Father

4. Excluded: Son of a Half-Brother (Father’s side)

Excluded by:

• Father
• Son
• Grandfather
• Grandson
• Full Brother
• Half-Brother through the Father
• Son of Full Brother

5. Excluded: Full Uncle (Father’s full brother)

Excluded by:

• Father
• Son
• Grandfather
• Grandson
• Full Brother
• Half-Brother through the Father
• Son of Full Brother
• Son of Half-Brother through the Father

6. Excluded: Paternal Half-Uncle (Father’s half-brother)

Excluded by:

• Father
• Son
• Grandfather
• Grandson
• Full Brother
• Half-Brother through the Father
• Son of Full Brother
• Son of Half-Brother through the Father
• Full Uncle

7. Excluded: Son of Full Uncle

Excluded by:

• All of the above, including the paternal half-uncle

8. Excluded: Son of Paternal Half-Uncle

Excluded by:

• The entire prior lineage, including:
  • Father
  • Son
  • Grandfather
  • Grandson
  • Full Brother
  • Half-Brother through the Father
  • Sons of both
  • Full and half-uncles

Women Who May Be Excluded

The exclusion principle applies equally to female heirs. Let’s examine some notable examples:

1. Excluded: Son’s Daughter (Granddaughter)

Excluded by:

• Presence of a son
• Two or more daughters
• Absence of a full brother (in some cases).

2. Excluded: Maternal Grandmother

Excluded by:

• Mother
• A closer maternal grandmother

3. Excluded: Paternal Grandmother

Excluded by:

• Father
• Mother
• Closer maternal or paternal grandmother

4. Excluded: Full Sister

Excluded by:

• Father
• Son
• Grandson

5. Excluded: Half-Sister through Father

Excluded by:

• Father
• Son
• Grandson
• Full brother
• Two full sisters (if no brother is present)
• Full sister alongside a daughter or granddaughter

6. Excluded: Half-Sister through Mother

Excluded by:

• Father
• Grandfather
• Son or Daughter
• Grandchildren

Summary

The structure of exclusion in Islamic inheritance is rooted in a deep ethical and familial logic. It ensures that those with the most direct responsibility and proximity to the deceased — especially male lineal descendants and ascendants — are prioritized. This framework, however, is not arbitrary. It has been extensively codified in classical Islamic jurisprudence, offering clarity and fairness while minimizing disputes.

For anyone managing or distributing an inheritance under Islamic law, awareness of these exclusions is essential to ensure that the wealth of the deceased is distributed justly — as intended by divine injunction.