Q. A friend of mine made intention to perform Umrah in December 2014 (his wife, and two daughters), however he wants to take his wife sister with.
PS. the wife and the sister are from two different fathers. Can he (my friend) be a Mahram for the wifes sister.
(Question published as received)
A. The husband is considered to be a non-Mahram (stranger) to his wife’s sister (whether there are maternal or paternal sisters).
Hence, in the inquired situation, the husband cannot be a Mahram for the wife’s sister.
And Allah Knows Best