Mahrams for a woman...
Mahrams for a woman: Father Brother Paternal uncle (father’s brother) Maternal uncle (mother’s brother) Maternal and paternal grandfathers, and their fathers Mother’s maternal and paternal uncles Father’s maternal and paternal uncles Half brothers Husband Father-in-law Husband’s paternal grandfather, and their fathers Husband’s maternal grandfather, and their fathers Husband’s sons Husband’s grandsons.
Son and sons of her children Nephew – son of her sister Nephew – son of her brother Son-in-law The remaining men are Non-Mahrams, however there may be exceptions to this rule by way of marriage and with certain conditions explained in detail in the books of Fiqh. A good example: This woman’s husband dies, after the days of ‘iddat’ the brother of her husband may marry this woman and thus will become her Mahram. A sister’s husband is Non-Mahram.
As long as one’s sister is married to him and is living, he cannot marry his wife’s sister. This is why one needs to observe Hijab in his presence. Similarly the husband’s brothers are also non-mahrams to the wife. Previous…