He is married to his maternal aunt through breastfeeding

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Check below answers in case you are looking for other related questions:
What is the ruling on drinking one’s wife’s milk?
Can he marry the daughter of a woman who was breastfed by his mother?

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Related Answers:
Ruling on milk banks
Their father’s wife breastfed a baby girl – is she regarded as their sister?
Ruling on breastfeeding and the wisdom behind it
What is the ruling on drinking one’s wife’s milk?
Can he marry the daughter of a woman who was breastfed by his mother?

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