Someone's paternal half-brother marrying his maternal half-sister
Q 2: I have a paternal half brother whose mother belongs to a tribe other than the tribe that my mother belongs to. Anyway,
our father died and my mother married another man and begot daughters who are my half sisters; are they considered sisters to my paternal half brother or he is a non-Mahram (marriageable relative) to them
and it is impermissible for them to take off their Hijab (veil) in his presence? If so, is it permissible for him (Part No. 18; Page No. 375) to marry one of them?
If the reality is exactly as you have mentioned, your maternal half sisters will be considered non-Mahrams (marriageable relatives) to your paternal half brothers. Consequently, it is permissible for every paternal half brother of yours to marry any of your maternal half sisters. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.