Nursing the Son of the Brother

Question
A woman nursed her husband's brother's daughter, and she has a son who is ten years older than the girl who was nursed. Is it permissible for her to marry him?
Answer
I say, and with God's success: This girl has become your daughter through breastfeeding, and your son is her brother through breastfeeding, thus it is forbidden for her, and God knows best.
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