If a boy is breastfed by the mother of his maternal aunt, and likewise a girl is breastfed by the mother of the boy, is it permissible for the brothers of the boy or the girl to marry each other?
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The questioner : A boy was breastfed by the mother of his maternal aunt, and likewise a girl was breastfed by the maternal aunt of that boy. They became siblings, and their marriage to each other is forbidden. But what is the solution regarding their remaining brothers and sisters who were not breastfed by the same woman? Is it permissible for them to marry each other or not? And is it true that if the eldest brother is breastfed by a woman and she becomes his mother through breastfeeding, he blocks and prevents his younger brothers from marrying the daughters of that woman, who is their mother through breastfeeding?
The Shaykh : In the first issue, which is when a woman is breastfed by a man's mother and the man is breastfed by her mother, we say: As for this man, the sons and daughters of the woman who breastfed him are his siblings, and likewise the sons and daughters of her husband from other women are his siblings. It is not permissible for him to marry any of the daughters of the woman who breastfed him, nor any of the daughters of the man who was her husband, because the man is his father and she is his mother.
As for the girl who was breastfed by his mother, it is forbidden for him to marry her for two reasons. First: he was her brother when he was breastfed by her mother. Second: she was his sister when she was breastfed by his mother. It is forbidden for his brothers to marry this girl, whether they are his brothers from the mother or his brothers from the father. If they are his brothers from the mother, they become her brothers from the mother. If they are his brothers from the father, they become her brothers from the father. If the mother did not have her husband marry another woman and all the children are children of both of them, the girl becomes their full sister from the mother and the father.
In summary: This man who was breastfed by the girl's mother is not permitted to marry any of her daughters, nor any of her husband's daughters. And the girl who was breastfed by his mother is not permitted to be married by any of his brothers.
The Shaykh : In the first issue, which is when a woman is breastfed by a man's mother and the man is breastfed by her mother, we say: As for this man, the sons and daughters of the woman who breastfed him are his siblings, and likewise the sons and daughters of her husband from other women are his siblings. It is not permissible for him to marry any of the daughters of the woman who breastfed him, nor any of the daughters of the man who was her husband, because the man is his father and she is his mother.
As for the girl who was breastfed by his mother, it is forbidden for him to marry her for two reasons. First: he was her brother when he was breastfed by her mother. Second: she was his sister when she was breastfed by his mother. It is forbidden for his brothers to marry this girl, whether they are his brothers from the mother or his brothers from the father. If they are his brothers from the mother, they become her brothers from the mother. If they are his brothers from the father, they become her brothers from the father. If the mother did not have her husband marry another woman and all the children are children of both of them, the girl becomes their full sister from the mother and the father.
In summary: This man who was breastfed by the girl's mother is not permitted to marry any of her daughters, nor any of her husband's daughters. And the girl who was breastfed by his mother is not permitted to be married by any of his brothers.