Who are a woman's mahrams?

The rule that decides it

Shaykh Ibn Uthaymeen gave the definition plainly: a mahram is her husband and every man who is forbidden to her permanently (ta'bid), whether by kinship, by breastfeeding, or by marriage. Anything less than permanent does not create mahram status.

"The mahrams of a woman are her husband and every man who is permanently forbidden to her through kinship, breastfeeding, or marriage. As for one forbidden to her non-permanently, he is not a mahram to her."— Shaykh Ibn Uthaymeen, Fatawa Nur 'ala al-Darb

This is why her husband's brother, his paternal uncle and his maternal uncle are not mahrams. They are forbidden to her only while she remains married to her husband, so the prohibition is temporary. Shaykh Ibn Baz ruled that she may not uncover before them, may not be alone with any of them, and must observe hijab.

By kinship: seven

The Qur'an names them in Surah al-Nisa:

"Forbidden to you are your mothers, your daughters, your sisters, your paternal aunts, your maternal aunts, your brother's daughters, and your sister's daughters."— Qur'an 4:23

Read from the woman's side, these seven are her father, her son, her brother, her paternal uncle, her maternal uncle, her brother's son, and her sister's son. Shaykh Ibn Baz and Shaykh Ibn Uthaymeen both list them this way, and IslamWeb notes that a grandfather's brother or a grandmother's brother stands in the place of the uncle, so they are mahrams too.

By breastfeeding: the same seven

"What is forbidden by breastfeeding is forbidden by kinship."— Sahih Muslim 1444

So her foster-father, foster-son, foster-brother, foster-paternal-uncle, foster-maternal-uncle, foster-brother's son and foster-sister's son are all mahrams to her, exactly as their kinship counterparts would be. Shaykh Ibn Uthaymeen adds one limit worth knowing: the prohibition spreads to the nursed child and his own descendants, not to his parents, brothers or uncles — his father may marry the woman who nursed him.

By marriage: four

The first three take effect the moment the contract is made, even if the marriage later ends in divorce or death. The fourth is different: her stepfather becomes a mahram to her only once he has consummated the marriage with her mother. If he divorces her mother before that, he remains a non-mahram to her.

Who is not a mahram

• Her husband's brother, uncle and cousin: Shaykh Ibn Baz is explicit that none of them is a mahram, and that she may not uncover before them or be alone with them.
• Her sister's husband, her husband's other wives' relatives: forbidden only while the marriage lasts.
• The husbands of her brother's daughters: Shaykh Ibn Baz ruled these are not mahrams to her.
• Other women: a mahram is always a man. Shaykh Ibn Baz notes that her mother, sister and aunt are not mahrams to her in this sense — the term applies to men she may appear before unveiled.

Key takeaways

• A mahram is a man forbidden to her permanently — by kinship, breastfeeding, or marriage — plus her husband.
• Kinship gives seven, breastfeeding gives the same seven, and marriage gives four.
• Her husband's father and sons, and her daughters' husbands, become mahrams at the contract; her stepfather only after he consummates the marriage with her mother.
• Her husband's brother, uncle and cousin are not mahrams — she must observe hijab with them and never be alone with them.
• A prohibition that ends when a marriage ends is not mahram status.

Further reading

• Ibn Uthaymeen, al-Sharh al-Mumti'
• Ibn Baz, Fatawa Nur 'ala al-Darb

And Allah knows best.