Q: I am writing to seek your guidance on a family matter concerning marriage eligibility in Islam.
I am considering the possibility of proposing marriage between my daughter and her first cousin from mother side. However, there is a specific detail that we need to clarify: the boy's younger sister is also our daughter's radaai sister (sister through breastfeeding).
Given this relationship, I am unsure if it is permissible for my daughter to marry her cousin. Could you please provide clarity on this matter according to Islamic principles?
A: Nikaah between the both is permissible. The boy's younger sister being the foster-sister of the girl will not affect the nikaah in any way.
And Allah Ta'ala (الله تعالى) knows best.
Answered by:
Checked & Approved: