The ruling on a man marrying his brother’s mother through breastfeeding

Question:
He says: Honorable Shaykh, may Allah grant you success. One of the neighbors’ sons was breastfed by my mother along with me. Is it permissible for me to marry his mother? One of the neighbors was breastfed, meaning an adult man, an elderly neighbor, was breastfed by his mother. Is this permissible?

Answer:
Or do you mean a boy, meaning an infant, who was breastfed by your mother? Is it permissible for you to marry the mother of the one who was breastfed by your mother? Because she is a stranger to you, and there is no breastfeeding relationship between you and her. The rule is that the kinship established by breastfeeding extends only to the breastfed child and his descendants, such as his sons and daughters. It does not extend to his brothers, nor to his ancestors, such as his father and mother.