A woman's mahram is a male relative permanently prohibited from marrying her because of blood relationship, qualifying breastfeeding or a lawful marriage relationship. Someone temporarily prohibited from marrying her does not become her mahram for that reason.

A husband may accompany his wife, and their marriage permits what Allah has made lawful between spouses. He is not a mahram under this technical definition: a mahram cannot marry her, whereas her husband is married to her. Hence the expression "husband or mahram" in this discussion.

The Arabic word "ajnabi" in these rulings means a non-mahram man, even if he is a cousin or from the same country. It does not refer to nationality.

When identifying women prohibited in marriage, Allah says:

﴿حُرِّمَتْ عَلَيْكُمْ أُمَّهَاتُكُمْ وَبَنَاتُكُمْ وَأَخَوَاتُكُمْ وَعَمَّاتُكُمْ وَخَالَاتُكُمْ وَبَنَاتُ الْأَخِ وَبَنَاتُ الْأُخْتِ﴾

Quran 4:23, an excerpt. In meaning: mothers, daughters, sisters, paternal aunts, maternal aunts, brothers' daughters and sisters' daughters are prohibited in marriage. The corresponding male relatives who are a woman's blood mahrams are:

1. Her father and grandfathers through either parent, however far up the family line.
2. Her sons and the sons of her sons or daughters, however far down the family line.
3. Her full brothers and half-brothers through either parent.
4. Her paternal uncles, including the paternal uncles of her parents and earlier ancestors.
5. Her maternal uncles, including the maternal uncles of her parents and earlier ancestors.
6. Her brothers' male descendants, through sons or daughters.
7. Her sisters' male descendants, through sons or daughters.

These are categories of relationship, not a limit on the number of mahrams someone may have. Male cousins through any of her uncles or aunts are not mahrams merely because they are cousins.

The Prophet, peace and blessings be upon him, said:

«يَحْرُمُ مِنَ الرَّضَاعِ مَا يَحْرُمُ مِنَ النَّسَبِ»

Sahih al-Bukhari 2645, an excerpt. In meaning: breastfeeding establishes marriage prohibitions corresponding to those established by blood relationship. Qualifying nursing can therefore establish relationships such as a milk-brother or milk-uncle. It does not establish biological lineage or inheritance as birth does.

The nursing woman becomes the child's milk-mother, and the husband to whom her milk is attributed becomes the milk-father. The children of either milk-parent become the child's milk-siblings, even if they were not breastfed together or were born from other marriages.

Ibn Baz required five known nursing feeds within the first two years, before weaning. Jurists differed over the required number; the ruling followed here is Ibn Baz's.

If a relative says, "perhaps he was nursed with us," that alone does not establish a mahram relationship. Find out who breastfed the child, when and how often, then ask a knowledgeable scholar about anything unclear, especially where marriage, covering or seclusion would be affected.

The following relationships establish mahram status, subject to a valid marriage:

1. A husband's father and grandfathers become mahrams to his wife through the valid contract, even before the couple consummates the marriage.
2. A husband's sons and the male descendants of his sons or daughters become mahrams to his wife through the valid contract, even if they are not her children.
3. Her daughter's or granddaughter's husband becomes her mahram through the valid contract, even before consummation.
4. The husband of a woman's mother or grandmother becomes her mahram only after consummating the marriage with that mother or grandmother. Engagement, the contract alone or merely being secluded together is not sufficient for this particular relationship.

The fourth condition comes from Quran 4:23. A mother's husband before consummation must not be treated like a husband's father, whose mahram status follows from the contract. Once these permanent marriage relationships are established, divorce or the spouse's death does not by itself remove them.

A husband's brother, uncle or cousin, and a sister's or aunt's husband, are not mahrams merely through those connections. Calling someone "like her brother" does not create a mahram relationship.

A man cannot marry his wife's sister while remaining married to his wife, but her sister is not his mahram. Equally, a sister's husband is not a mahram to her sister. Mahram status requires a permanent prohibition arising from a recognised cause, not simply that marriage is unavailable at present.

This also explains why a married woman does not become a mahram to other men. Her existing marriage prevents them from marrying her, but does not permit them to be secluded with her or shake her hand.

The Prophet, peace and blessings be upon him, said:

«لَا يَخْلُوَنَّ رَجُلٌ بِامْرَأَةٍ إِلَّا وَمَعَهَا ذُو مَحْرَمٍ، وَلَا تُسَافِرِ الْمَرْأَةُ إِلَّا مَعَ ذِي مَحْرَمٍ»

Sahih Muslim 1341, an excerpt. In meaning: a man must not be alone with a woman without her mahram, and a woman must not travel without a mahram. Prohibited seclusion (khalwah) includes a man and a non-mahram woman being alone in a private home or room where others would not ordinarily enter. Trust, good intentions or calling the meeting work or teaching does not make it permissible.

Necessary, permissible conversation in a visible setting, with proper covering, lowered gazes and no seductive speech, is not the same as a secluded meeting. Consider who is actually present and able to enter, not merely whether a door is unlocked or other people are somewhere far away in the building.

When the Prophet was asked about a husband's male relative, he said:

«الْحَمْوُ الْمَوْتُ»

Sahih al-Bukhari 5232. In meaning: the in-law is death. This is a severe warning against carelessness with a non-mahram relative of the husband, such as his brother, whose access to the home may be taken for granted. It does not refer to the husband's father or son, who are mahrams, nor does it accuse every relative of wrongdoing.

The Prophet, peace and blessings be upon him, said:

«إِنِّي لَا أُصَافِحُ النِّسَاءَ»

Sunan an-Nasa'i 4181, an excerpt from the account of women giving their pledge: "I do not shake hands with women." Ibn Baz ruled against handshakes between non-mahrams, including through a barrier, while permitting polite verbal greetings.

A female cousin or brother's wife does not become a mahram through familiarity, and social courtesy does not permit the prohibited handshake. A friendly explanation can be enough: "I'm pleased to meet you. I don't shake hands with the opposite sex for religious reasons." Continue welcoming the person respectfully, without insulting them or turning the encounter into an argument.

Both men and women are addressed by these rulings. A man should not pressure a woman to shake his hand, then blame her for observing the rule.

The hadith above prohibits travel without a mahram. In its continuation, a man explained that his wife had set out for Hajj while he had enlisted for an expedition. The Prophet told him:

«انْطَلِقْ فَحُجَّ مَعَ امْرَأَتِكَ»

Sahih Muslim 1341. In meaning: go and perform Hajj with your wife. Ibn Baz required the husband or mahram to accompany the woman during travel, including flights. One relative dropping her at the airport and another meeting her on arrival is not sufficient according to that ruling. This article follows his position; jurists did differ over some cases of obligatory Hajj with trustworthy company.

The accompanying mahram must have reached puberty and be of sound mind, as Ibn 'Uthaymin explained. A small child is not sufficient merely because he is her son or brother. His trustworthiness and ability to accompany and protect her also matter, and doubtful circumstances should be referred for qualified advice.

The question is whether the journey counts as travel under Islamic law, not simply how many hours a flight takes. Not every ordinary trip within a town is such travel, although the rules on covering and seclusion remain. Another woman's presence may remove seclusion in a particular situation; it does not make her a travel mahram.

Compelling necessity or danger to life is not treated like an optional journey. Seek advice specific to the circumstances and what is possible, rather than turning necessity into a blanket label for every preference or ordinary difficulty.