His Two Wives Are Sisters Through
Breast-feeding
Question :
A questioner is asking: If it happened that a man married two women and he was borne a child by each of them, then after a while, it was discovered through a testimony from some of their relatives that they are sisters through breast-feeding, what must he do in this situation?
Answer:
In this situation, if it is confirmed that his two wives were sisters through breast-feeding, then the marriage to the second of them is invalid: That is, the marriage to the last wife is invalid and he must part from her, because the incorrectness of the marriage has become apparent; indeed its invalidity has become apparent. As for the children born during this time, they are his legitimate children, because in fact, he was in a state of ignorance at the time of having sexual intercourse with her.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 5 Pages 435-436
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