As salaam Wa alaikum,
Are my stepfather sons from the ex-wife, considered mahram for the daughter whom he had with my mother?
Wa Alaikum As Salaam,
Yes, the sons of your stepfather from his ex-wife will be mahram for the daughter whom he had with your mother. They all share the same father, and the sons will be half-brothers of the girl.
And Allah Knows best
Mufti Waseem Khan
This answer was collected from DarulUloomTT.net, which is operated under the supervision of Mufti Waseem Khan from Darul Uloom Trinidad and Tobago.