He Married His Sister Through Breast-feeding
Question :
It became evident to me after consummating the wife breast-feeding, because I was breast-fed with her sister; is she forbidden to me in these circumstances?
Answer:
Yes, if the matter is as you have described it, that you were breast-fed with your wife's sister by her mother, meaning that you were breast-fed by your wife's mother or by her father's wife, then you are, in this situation, a brother and the contract will be invalid. But you must know that the breast- feeding has no effect, unless there were at least five breast- feedings or more within the two years before weaning. So if it was less than that, then there is no effect from it, and prohibition will not occur. If you are certain that you were breast-fed five times or more during the first two years with this woman whom you have married, then you must both be parted, due to the fact that the marriage is not valid. As for the children born before it was known, they are legally attributed to you, because these children were created from water (i.e., sperm) by sexual intercourse which took place in ignorance, and when sexual intercourse which takes place in ignorance, the children born are attributed to his lineage, as the scholars have said.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 5 Pages 436-437
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