The Awareness of Spouses Regarding the Possibility of Being Siblings by Breastfeeding and the Consequences Thereof

Question
A man married a woman and had children with her, then they remembered that the man's mother had breastfed his wife several times. The man's mother believed that this breastfeeding does not prohibit marriage or establish lineage, noting that she had been divorced for ten years. However, when she breastfed the wife—of course, when she was less than two years old—milk came out from her breast. Is this considered milk or something else? Does this make the wife prohibited to the man, and what is the ruling regarding the children? If it is prohibited, is she required to divorce and observe a waiting period?
Answer
I say, and with God's help: If milk comes out of her and the wife has breastfed before she reaches the age of two, then she is forbidden to her husband, and they should be separated; because he is her brother through breastfeeding. This is based on certainty of breastfeeding with milk, not merely on suspicion. And God knows best.
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