[h=3]Mahrams by marriage[/h] A woman’s mahrams by marriage are those whom it is forever forbidden to marry, such as the father’s wife, the son’s wife or the wife’s mother. (Sharh al-Muntaha, 3/7)
The mahram by marriage of the father’s wife is his son from another wife, for the wife of the son it is his father, and for the mother of the wife it is the husband. Allah says in Surah al-Nur (interpretation of the meaning):
“… and not to reveal their adornment except to their husbands, or their fathers, or their husband’s fathers, or their sons, or their husband’s sons…” [al-Noor 24:31].
Their husband’s fathers and their husband’s sons are mahrams of the woman by marriage. Allah mentioned them along with their (the women’s own) fathers and sons, and made them all the same in the sense that women may display their adornments in front of them. (Al-Mughni, 6/555)