Mahram

They are your relatives but they aren’t your mahram

Your mother’s nephew’s son is her mahram.

No.

She is his step grandmother and she is Mahram to him.

Your step son is not a Mahram to your other wives or to your daughters. I don’t believe I told you that he is a Mahram to your first wife. As for marrying this woman, this is entirely up to You!

No, he wouldn’t be her Mahram!

Yes, she is still your mahram.

No, they are not related to her and can marry her! Only the step father is her Mahram.

No, it isn’t, as this would be approving such sins!