Hajb: The Blocking Rules in Islamic Inheritance

Hajb — the blocking or exclusion of certain heirs by the presence of others — is one of the most complex and fascinating aspects of Islamic inheritance law. Without understanding Hajb, it is impossible to correctly calculate inheritance shares for any but the simplest family configurations. A son blocks a son's son; a father blocks a grandfather; multiple daughters block son's daughters. This guide maps every Hajb rule with worked examples to make this complex subject understandable.

Two Types of Hajb

Hajb operates in two distinct ways, and it is essential to understand both:

Hajb Hirman (Total Exclusion)

In total exclusion, the blocked heir receives nothing — they are completely removed from the inheritance. For example, a son's son is totally excluded by the presence of a son. He receives no share at all.

Hajb Nuqsan (Partial Reduction)

In partial reduction, the heir still inherits but their share is reduced. For example, a husband's share is reduced from 1/2 to 1/4 when children are present. He still inherits, but less than he would without children.

The Six Quranic Heirs and Their Immunity

As established in our introduction to Faraid, six categories of heirs can NEVER be totally excluded:

1. Husband
2. Wife (or wives)
3. Father
4. Mother
5. Son
6. Daughter

These six always receive some share, though their share may be reduced through Hajb Nuqsan. All other heirs — grandparents, grandchildren, siblings, uncles, etc. — can be totally excluded through Hajb Hirman.

Complete Hajb Rules: Total Exclusion

Here is the complete table of total exclusions in Islamic inheritance. Each rule shows which heir is blocked and by whom:

Descendants Blocking Other Descendants

Blocker (Present)	Blocked (Excluded)	Reasoning
Son	Son's son (and lower)	Closer descendant excludes more remote
Son	Son's daughter (and lower)	Closer descendant excludes more remote
Daughter (one, with no son)	Son's daughter (alone)	Single daughter takes 1/2, no room for granddaughter's 1/2
Two+ daughters (no son)	Son's daughters (all)	Multiple daughters take 2/3, no room for granddaughters

Ascendants Blocking Other Ascendants

Blocker	Blocked	Notes
Father	Paternal grandfather (any level)	Closer ascendant excludes more remote
Father	Paternal grandmother (Hanafi, Shafi'i, Maliki)	Father blocks his mother from inheriting
Mother	All grandmothers (paternal and maternal)	Mother blocks her mother and mother-in-law

Descendants Blocking Siblings

Blocker	Blocked	Notes
Son (any)	All siblings (full, paternal, maternal)	Male descendant excludes all siblings
Son's son (and lower)	All siblings	Male descendant through son excludes siblings
Daughter (any)	Maternal siblings	Any descendant blocks maternal siblings
Son's daughter (any)	Maternal siblings	Any descendant blocks maternal siblings

Father and Grandfather Blocking Siblings

Blocker	Blocked	School Differences
Father	All siblings (full, paternal, maternal)	Unanimous across schools
Paternal grandfather (no father)	All siblings	Hanafi, Hanbali; Shafi'i and Maliki permit siblings with grandfather

Siblings Blocking Other Siblings

Blocker	Blocked	Notes
Full brother	Paternal brother	Closer kinship excludes more remote
Full sister (with full brother)	Paternal sister	Full siblings as group exclude paternal
Two+ full sisters (no full brother)	Paternal sister	Multiple full sisters take 2/3, blocking paternal

Partial Hajb Rules: Share Reduction

In partial Hajb, the heir still inherits but receives a reduced share. The main cases:

Spouse Share Reduction

Heir	Default Share	Reduced Share	Trigger
Husband	1/2	1/4	Children or son's children (male or female) present
Wife	1/4	1/8	Children or son's children (male or female) present

Mother Share Reduction

Heir	Default Share	Reduced Share	Trigger
Mother	1/3	1/6	Children or son's children present
Mother	1/3	1/6	Two or more full/paternal/maternal siblings present

Son's Daughter Reduction

Heir	Default Share	Reduced Share	Trigger
Son's daughter (alone, no son)	1/2	1/6	One daughter present (no son)

Paternal Sister Reduction

Heir	Default Share	Reduced Share	Trigger
Paternal sister (alone, no full sister)	1/2	1/6	One full sister present (no full brother)

Worked Examples of Hajb

Example 1: Son Blocks Son's Son

A man dies leaving a wife, one son, and one son's son (from a predeceased son).
- Wife: 1/8 (children present)
- Son: takes residue as Asabah = 7/8
- Son's son: BLOCKED by son, receives 0
- Total: 100%

Example 2: Father Blocks Paternal Grandfather

A man dies leaving a wife, father, paternal grandfather, and one daughter.
- Wife: 1/8
- Daughter: 1/2 (alone, no son)
- Father: 1/6 (fixed) + residue as Asabah = 1/6 + 5/24 = 9/24 = 3/8
- Paternal grandfather: BLOCKED by father, receives 0
- Total: 100%

Example 3: Two Daughters Block Son's Daughters

A woman dies leaving a husband, two daughters, and one son's daughter (from predeceased son).
- Husband: 1/4 (children present)
- Two daughters: 2/3 shared (each gets 1/3)
- Residue: 1 - 1/4 - 2/3 = 1/12
- Son's daughter: BLOCKED by two daughters, receives 0
- Residue 1/12 returns through Radd to daughters (and husband in some views)
- Total: 100%

Example 4: Father Blocks All Siblings

A man dies leaving a wife, father, mother, and two full brothers.
- Wife: 1/4 (no children)
- Father: 1/6 (fixed) + residue as Asabah
- Mother: 1/6 (reduced from 1/3 due to siblings — but siblings are blocked, so does mother stay at 1/6 or revert to 1/3?)
- This is a disputed case: Hanafis hold that since the siblings are blocked, they don't reduce the mother's share; she keeps 1/3. Other schools hold that the presence of siblings (even if blocked) reduces her to 1/6. The Hanafi view is followed in most South Asian jurisdictions.

Example 5: Son Blocks All Siblings

A man dies leaving a wife, one son, and one full brother.
- Wife: 1/8 (children present)
- Son: takes residue = 7/8
- Full brother: BLOCKED by son, receives 0
- Total: 100%

Example 6: Multiple Siblings Reduce Mother's Share

A man dies leaving a wife, mother, and three full brothers (no children, no father).
- Wife: 1/4
- Mother: 1/6 (reduced from 1/3 due to multiple siblings)
- Residue: 1 - 1/4 - 1/6 = 7/12
- Brothers as Asabah: share 7/12 equally
- Total: 100%

Special Cases and Disputed Rulings

Grandfather with Siblings

The Hanafi and Hanbali schools hold that the paternal grandfather (when father is absent) blocks all siblings, just as the father would. The Shafi'i and Maliki schools hold that the grandfather shares with full and paternal siblings — they do not block each other completely. This is a significant school difference that affects inheritance distribution in real cases.

Grandfather with Daughter

When a paternal grandfather and a daughter inherit together (no son, no father), the grandfather receives 1/6 (fixed) plus residue as Asabah, and the daughter receives 1/2. If the residue is positive, the grandfather takes it; if the fixed shares exceed 100%, Awl (proportional reduction) applies.

"Al-Gharradatan" Case

This famous case involves a wife, mother, paternal grandfather, and two full sisters. The fixed shares are: wife 1/4, mother 1/6, two sisters 2/3. Total: 1/4 + 1/6 + 2/3 = 13/12 > 1. Awl is applied to reduce proportionally. The grandfather, in the Shafi'i view, shares with the sisters as Asabah, but in the Hanafi view he is blocked by them. This is one of the most disputed cases in Faraid.

Practical Implications for Muslims Today

Drafting an Islamic Will

Understanding Hajb is essential when drafting an Islamic will. The will must reflect the correct shares after applying all blocking rules. A common error is assuming that grandchildren inherit when, in fact, they are blocked by the presence of children. If you want to provide for grandchildren, you must do so through the Wasiyyah (up to 1/3 of the estate), not through the default inheritance shares.

Wasiyyah Wajiba (Mandatory Bequest)

Some Muslim-majority countries (Pakistan, Egypt, Jordan, Morocco, Kuwait, Syria) have enacted "Mandatory Bequest" legislation that overrides Hajb for grandchildren through predeceased children. Under this law, grandchildren whose parent died before the grandparent receive up to 1/3 of the estate as if their parent had been alive. This contemporary legislation addresses the perceived harshness of grandchildren being totally excluded by a surviving uncle.

Verifying Calculator Outputs

When using our Faraid calculator or any other tool, understanding Hajb helps you verify that the output is correct. If you have a son and a son's son in your family, the son's son should not appear in the distribution. If the calculator includes him, it is incorrect.

Common Hajb Mistakes

• Assuming grandchildren always inherit: They are blocked by children. Provide for them through Wasiyyah if desired.
• Assuming siblings always inherit: They are blocked by children, father, and (in Hanafi view) grandfather.
• Treating partial Hajb as total: A husband whose share is reduced from 1/2 to 1/4 still inherits — he is not excluded.
• Forgetting that mother's share is reduced by siblings: Even blocked siblings reduce the mother's share in the non-Hanafi view.
• Confusing paternal and maternal siblings: Maternal siblings have different rules and are blocked by any descendant.

Conclusion

Hajb — the blocking rules of Islamic inheritance — is essential knowledge for anyone involved in estate distribution. The rules are extensive but follow logical patterns: closer kinship excludes more remote, descendants block siblings, ascendants block other ascendants, and certain combinations trigger partial reduction rather than total exclusion. Understanding these rules ensures that estates are distributed according to Sharia and that the rights of all eligible heirs are protected. For complex cases, always consult a qualified scholar — Faraid is a science where small details can dramatically change the outcome.

Use our Faraid calculator which applies Hajb automatically, or read our guide to Awl and Radd for special adjustment mechanisms.

Frequently Asked Questions About Hajb

1. If my father is alive, does my grandfather inherit from me?

No. The father completely blocks the paternal grandfather from inheritance. This is total exclusion (Hajb Hirman). The father is a closer ascendant, and the closer excludes the more remote. If your father has passed away but your paternal grandfather is alive, then the grandfather inherits (1/6 + residue if children exist, or full residue if no children).

2. Do my children block my siblings from inheriting?

Yes. Any descendant — son, daughter, son's son, son's daughter — blocks all siblings (full, paternal, and maternal) from inheritance. This is because descendants are closer kin than siblings. If you have children, your siblings will not inherit from you (unless your children predecease you, leaving grandchildren who may or may not block siblings depending on the school).

3. My son died before me — do his children (my grandchildren) inherit?

By default in classical Sharia, no. A son blocks a son's son (your grandson through your son). If your son has predeceased you, the grandson is blocked by the rule of "closer descendant excludes more remote." However, several Muslim-majority countries (Pakistan, Egypt, Jordan, Morocco, Kuwait, Syria) have enacted "Mandatory Bequest" (Wasiyyah Wajiba) legislation that gives grandchildren through a predeceased child up to 1/3 of the estate as if their parent had been alive. This contemporary law overrides the classical Hajb rule in these jurisdictions.

4. Does my husband's sister inherit from me?

No. In-laws are not heirs in Islamic inheritance. Your husband's siblings, parents, and other relatives do not inherit from you. Only blood relatives (and the spouse) inherit. The only in-law who inherits is the spouse themselves. This rule prevents the fragmentation of estates across multiple extended families.

5. If I have two daughters and no son, do they block my son's daughters?

Yes. Two or more daughters (without a son) take 2/3 of the estate as their fixed share, leaving no room for son's daughters to inherit. The son's daughters are totally excluded (Hajb Hirman) by the presence of two or more daughters. However, a single daughter (alone, no son) does NOT block a single son's daughter — the son's daughter would receive 1/6 in that case (completing the 2/3 share with the daughter's 1/2).

6. Can siblings ever inherit alongside parents?

It depends on which parent and which school. The father blocks all siblings (unanimous). The paternal grandfather blocks siblings in the Hanafi and Hanbali schools, but in the Shafi'i and Maliki schools, full and paternal siblings can inherit alongside the grandfather (sharing the residue). The mother never blocks siblings, but the presence of two or more siblings reduces the mother's share from 1/3 to 1/6 (partial Hajb).

7. Does a half-sibling inherit the same as a full sibling?

Not always. Full siblings (same father and mother) take precedence over paternal siblings (same father, different mother). A full brother blocks a paternal brother. A full sister receives 1/2 alone or 2/3 shared, while a paternal sister alone receives 1/2 but with a full sister receives 1/6. Maternal siblings (same mother, different father) have different rules entirely — they receive 1/6 (alone) or 1/3 (shared) as fixed share and do not take residue as Asabah.

8. What if all my close relatives have predeceased me — who inherits?

Islamic inheritance extends to quite distant relatives if closer ones are absent. The order continues: paternal uncles, then paternal uncle's sons (male cousins), then more distant paternal relatives. Only if there are absolutely no blood relatives (extremely rare) does the estate go to the Bayt al-Mal (state treasury). In practice, most people have at least some distant relatives who would inherit. A properly drafted will should specify the distribution according to Faraid for your specific family situation.

Case Studies: Hajb in Practice

Case Study 1: Son Blocks Siblings

A man dies leaving a wife, one son, two daughters, and two full brothers. Estate: $100,000. Wife: 1/8 = $12,500. Residue: $87,500 to children as Asabah (2:1 ratio). Brothers: BLOCKED by son, receive nothing. Final: Wife $12,500, son $35,000 (2/5 of residue), each daughter $17,500 (1/5 of residue each). Total: $12,500 + $35,000 + $17,500 + $17,500 = $82,500. Wait — that doesn't add up. Let me recalculate. Residue $87,500 with shares (2+1+1)=4. Son: 87,500 × 2/4 = $43,750. Each daughter: 87,500 × 1/4 = $21,875. Total: $12,500 + $43,750 + $21,875 + $21,875 = $100,000. ✓

Case Study 2: Father Blocks Grandfather

A man dies leaving a wife, father, paternal grandfather, and one daughter. Estate: $100,000. Wife: 1/8 = $12,500. Father: 1/6 (fixed) + residue as Asabah = $16,667 + $20,833 = $37,500. Daughter: 1/2 = $50,000. Paternal grandfather: BLOCKED by father, receives nothing. Total: $12,500 + $37,500 + $50,000 = $100,000. ✓

Case Study 3: Two Daughters Block Son's Daughters

A woman dies leaving a husband, two daughters, and one son's daughter (from a predeceased son). Estate: $100,000. Husband: 1/4 (children present) = $25,000. Two daughters: 2/3 shared = $66,667 (each $33,333). Son's daughter: BLOCKED by two daughters, receives nothing. Sum so far: 1/4 + 2/3 = 11/12. Residue: 1/12 = $8,333. No Asabah (no son, no father). Radd applies — surplus returns to non-spouse heirs (daughters). Daughters' final: $33,333 + $4,167 each = $37,500 each. Total: $25,000 + $37,500 + $37,500 = $100,000. ✓

Key Takeaways

• Hajb is the exclusion of certain heirs by the presence of others.
• Six Quranic heirs (spouse, parents, children) can never be totally excluded.
• A son blocks all siblings, all grandparents, and all more remote descendants.
• A father blocks the paternal grandfather and (in most schools) paternal grandmother.
• Two or more daughters block son's daughters.
• Maternal siblings are blocked by any descendant.
• Partial Hajb reduces shares (e.g., children reduce spouse's share).
• In-laws never inherit — only blood relatives and spouses.