This Breast-feeding Does not Prohibit Marriage
Question :
I am a young man of sixteen years of age and I want to marry my paternal uncle's daughter, but I have discovered that her younger sister was breast-fed by my elder sister. So is it permissible for me to marry her, bearing in mind that she was not breast-fed by my mother?
Answer :
There is no objection if you marry her, and there is no harm from her younger sister previously being breast-fed by your sister. This is because she is considered to be unrelated, since she was not breast-fed by your mother, and you were not breast-fed by her mother, nor by any of her sisters. So there is no kinship between you. As for her younger sister, she is not permissible for you, nor is she permissible for any of your brothers, since she was breast-fed by your mother, so she has become your sister.
Source:
Ibn Jibreen.
Fatawa Islamiyah, Vol. 5 Pages 237-238
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