ANSWER:

Whoever you share a father or a mother with is your sibling and mahram to you 

QUESTION: Is half sisters and brothers whose father or mother are same are mahram to each other? And they will be maternal paternal uncle and aunt for their sibling’s children and will also be mahram to their children?

Mahram | September 9, 2025 4:25 am
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QUESTION: Is it Haram to send my male cousin a picture of something i want him to order for me in private chat, no chitchating.
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QUESTION: Sheikh does the mother in law become mahram for the husband right after the marriage or does she become mahram only after the husband consumates the marriage with his wife?