Is it permissible for a man to marry his foster sister?

Question:
My brother was breastfed by my cousin, who is older than him. Is it permissible for him to marry her or not?

Answer:
There is a distinction here. If he was breastfed by your mother along with her, or if he was breastfed by her mother, or if she was breastfed by your mother, and it was five breastfeedings or more, she becomes his sister, so how can he marry her? If he was breastfed by her mother, he becomes her brother. If she was breastfed by his mother, she becomes his sister, provided it was five breastfeedings or more within the two-year period. Or if he was breastfed by her sister, he becomes her maternal uncle, or if he was breastfed by her sister, she becomes his maternal aunt. There is a distinction here; you should ask the court in your country, and they will inform you of the ruling.