He committed an immoral act with his wife’s daughter

He wanted to help a woman become Muslim, then they committed zina and she got pregnant, then she insisted on leaving him, and cut off ties with him

Is it permissible for him to marry the daughter of his wife’s sister after she dies

The wife’s grandmother is a mahram to the husband

Can a Muslim Man Marry a Non-Muslim Woman?

Can he marry the daughter of his father’s wife?

Can You Marry a Woman and Her Aunt?

It is not correct to draw an analogy between donating blood and breastfeeding to prove that someone is a mahram

She wants to marry a man whom she loves but he previously committed zina with her mother

Is there such a thing as a temporary mahram?