The Milk Brother

Question
My cousin and I are milk brothers; he nursed from my mother. Is he also considered a brother to my sisters, and is it not permissible for him to marry them?
Answer
I say, and with God's help: If he nursed from your mother, he becomes a brother to all of you, both males and females, and it is not permissible for him to marry one of your sisters. And God knows best.
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