What is the ruling on marrying the daughter of the maternal aunt of a boy who was breastfed by his grandmother?
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The questioner : He says: What is your opinion regarding a boy who was breastfed by his maternal grandmother? Is it permissible for him to marry his maternal aunt’s daughter, because she was not breastfed by her grandmother, or does the boy become the maternal uncle of the girl through breastfeeding?
The Shaykh : The boy here is the maternal uncle of his maternal aunt’s daughter through breastfeeding, because when he was breastfed by his grandmother, he became the brother of his maternal aunt and also of his mother. Therefore, the daughters of his maternal aunts and the daughters of his maternal uncles are among those forbidden to him, because he is their maternal uncle or their mother.
The Shaykh : The boy here is the maternal uncle of his maternal aunt’s daughter through breastfeeding, because when he was breastfed by his grandmother, he became the brother of his maternal aunt and also of his mother. Therefore, the daughters of his maternal aunts and the daughters of his maternal uncles are among those forbidden to him, because he is their maternal uncle or their mother.
Source
دروس وفتاوى المسجد الحرام لعام 1402هـ - 12 — binothaimeen.net (1:08:16)
The Arabic text is a machine transcription of the audio recording.