Source: Fatāwā Amunpuri by Shaykh Ghulām Muṣṭafā Ẓahīr Amn Pūrī
Hindah has six children — three sons and three daughters. She also breastfed the son of her maternal cousin. Is it permissible for this foster son to marry Hindah’s granddaughter?
It is not permissible for Hindah’s foster son to marry Hindah’s granddaughter, because he is her foster maternal uncle (رضاعی ماموں).
Just as a biological uncle is forbidden from marrying his niece, a foster uncle is also forbidden from marrying his foster niece.
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وَبَنَاتُ الْأُخْتِ
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“…And [forbidden to you in marriage are] the daughters of your sisters.”
Surah al-Nisā’ (4:23)
This includes both biological and foster nieces, because all relationships that are prohibited due to lineage are also prohibited through breastfeeding.
✦ A man breastfed by a woman becomes her son through Riḍāʿah.
✦ He is therefore the foster maternal uncle of all her grandchildren.
✦ Consequently, he cannot marry her granddaughter, as such a marriage is haram — exactly like with biological relationships.
✿ Question:
Hindah has six children — three sons and three daughters. She also breastfed the son of her maternal cousin. Is it permissible for this foster son to marry Hindah’s granddaughter?
✿ Answer:
It is not permissible for Hindah’s foster son to marry Hindah’s granddaughter, because he is her foster maternal uncle (رضاعی ماموں).
Just as a biological uncle is forbidden from marrying his niece, a foster uncle is also forbidden from marrying his foster niece.
❀ Quranic Evidence:
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وَبَنَاتُ الْأُخْتِ
**
“…And [forbidden to you in marriage are] the daughters of your sisters.”
Surah al-Nisā’ (4:23)This includes both biological and foster nieces, because all relationships that are prohibited due to lineage are also prohibited through breastfeeding.
✔ Summary:
✦ A man breastfed by a woman becomes her son through Riḍāʿah.
✦ He is therefore the foster maternal uncle of all her grandchildren.
✦ Consequently, he cannot marry her granddaughter, as such a marriage is haram — exactly like with biological relationships.
