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Home » Social Dealings » Marriage and Engagement

The Ruling on Marring the Daughters of the Sister's Co-Spouse

My sister is the wife of a man who has another wife and each of them breast-fed the other's sons. The first wife has daughters that are grown-up, and they were not breast-fed by my sister, so is it permissible for me to marry one of them or not?

If the matter is as you have mentioned in the question, then there is no sin upon you in marrying one of the daughters of your sister's co-spouse, as long as your sister did not breast-feed them, and there is no family tie, or other tie through fostering which would make them forbidden to you. And Allah is the Granter of success.

Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Darussalam Vol: 5 no.228
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