
In Islam, it is generally accepted that a woman can marry her deceased or divorced husband's brother once her 'Iddah' (waiting period) lapses. However, marrying one's brother-in-law's sister is a more complex issue. While some sources claim that it is permissible as long as the individuals involved are not related by blood or milk, others suggest that it may cause familial discord. Ultimately, the decision to marry is a personal one, and individuals are advised to carefully consider their feelings and the potential consequences before making any decisions.
| Characteristics | Values |
|---|---|
| Can you marry your brother-in-law in Islam? | It is not explicitly forbidden for a woman to marry her brother-in-law in Islam, but it is generally discouraged. |
| Religious text | The Quran states that "And lawful to you are [all others] beyond these [prohibited relationships], [provided] that you seek them [in marriage] with [gifts from] your property, desiring chastity, not unlawful sexual intercourse." (4:24) |
| Prophet Muhammad's guidance | Prophet Muhammad is reported to have said, "Beware of entering upon women." When asked about brothers-in-law, he replied, "The brother-in-law is death!" |
| Cultural influences | Family dynamics and cultural expectations, such as in Indian culture, may influence the acceptance of such marriages and play a role in decision-making. |
| Personal beliefs | Some Muslims believe that if Allah (swt) has willed a marriage, it will happen despite any obstacles or disapproval from families. |
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What You'll Learn
- Islam does not explicitly prohibit marrying your brother-in-law's sister
- Marrying a deceased husband's brother is permissible in Islam
- A brother-in-law is considered a non-mahrams (unrelated man) and therefore a wife should not be alone with him
- A man cannot marry two sisters simultaneously
- A man can marry his sister-in-law if her marriage with his brother has ended and her waiting period has lapsed

Islam does not explicitly prohibit marrying your brother-in-law's sister
In Islam, God is very clear on who is and is not permissible for a Muslim man to marry. As explained in Surat an-Nisa: [4:22-23]
> And do not marry those [women] whom your fathers married, except what has already occurred. Indeed, it was an immorality and hateful [to Allah] and was evil as a way. Prohibited to you [for marriage] are your mothers, your daughters, your sisters, your father's sisters, your mother's sisters, your brother's daughters, your sister's daughters, your [milk] mothers who nursed you, your sisters through nursing, your wives' mothers, and your step-daughters under your guardianship [born] of your wives unto whom you have gone in. But if you have not gone in unto them, there is no sin upon you. And [also prohibited are] the wives of your sons who are from your [own] loins, and that you take [in marriage] two sisters simultaneously, except for what has already occurred. [4:24] And [also prohibited to you are all] married women except those your right hands possess. [This is] the decree of Allah upon you. And lawful to you are [all others] beyond these, [provided] that you seek them [in marriage] with [gifts from] your property, desiring chastity, not unlawful sexual intercourse. So for whatever you enjoy [of marriage] from them, give them their due compensation as an obligation. And there is no blame upon you for what you mutually agree to beyond the obligation. Indeed, Allah is ever Knowing and Wise.
Nowhere in this list is a brother-in-law's sister mentioned, or any directly analogous variation on a relationship-through-marriage. The general ruling given by "And lawful to you are [all others] beyond these..." indicates that marrying her is permissible.
However, it is important to note that there might be other special cases that prohibit the marriage, such as if the brother-in-law's sister is also a milk sister (i.e., the mother of the brother-in-law's sister breastfed the person or the person's mother). Additionally, cultural and familial expectations may come into play, as seen in some of the examples provided in the sources, where marrying one's brother-in-law's sister may be seen as causing trouble or spoiling relationships between families.
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Marrying a deceased husband's brother is permissible in Islam
In Islam, it is permissible for a man to marry his brother's widow. This is supported by a verse in the Quran, which states: "O you who believe, it is not lawful for you to inherit women by compulsion". This means that a widow is free to marry anyone she wishes, or even remain unmarried, and no one is obligated to marry her.
The concept of a levirate marriage, in which the brother of a deceased man is obliged to marry his brother's widow, is not permissible in Islam. However, if both parties consent, there is no prohibition against it. The Quran does not impose any prohibition on marrying the widow or divorcee of one's brother.
According to some sources, a man may marry his brother's widow once the necessary waiting period has passed. This waiting period, known as 'Iddah or 'Idah, is mentioned in the Holy Quran and is required after a divorce or the death of a spouse.
It is important to note that while Islam permits marrying a deceased husband's brother, it is not a requirement or obligation. The widow is free to make her own choice and is not restricted to marrying her late husband's brother.
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A brother-in-law is considered a non-mahrams (unrelated man) and therefore a wife should not be alone with him
In Islam, a brother-in-law is not considered a mahram. A mahram is someone whom one is not allowed to marry at all under any circumstance. A woman is not permitted to travel with her husband's brother, who is not her mahram, because the Prophet (peace and blessings of Allah be upon him) said: "A woman should not travel unless she is with a mahram, and no man should enter upon a woman unless she has a mahram with her." (Al-Bukhari, 1729).
Among the conditions of a mahram for travel purposes are: the person should be someone whom she is permanently forbidden to marry, such as her grandfather, father, brother, paternal uncle, nephew, etc. A wife is permitted to serve her husband and his guests if she is wearing a complete hijab and nothing of her body can be seen. She is also permitted to sit with them as long as there is no sitting alone with one non-mahram man, wanton display, or other cause of temptation involved.
The Prophet (peace and blessings of Allah be upon him) forbade non-mahrams (unrelated men) to enter upon women, saying, "Beware of entering upon women." When asked about the brother-in-law, he said, "The brother-in-law is death!" (Reported by al-Bukhari, Fath al-Baari, 9/330). This warning is also found in the hadith, "No man sits alone with a (non-mahram) woman, but the Shaytan is the third among them" (reported by al-Tirmidhi, 1171).
The reason for this prohibition is that being alone with a brother-in-law may lead to religious doom if it results in sin. It may lead to actual death if an immoral deed is committed that dictates the punishment of stoning. It may also spell disaster for the woman if her husband's jealousy leads to divorce. Islam wants to preserve families and households and prevent anything that could lead to their destruction. Thus, a brother-in-law is considered a non-mahram, and a wife should not be alone with him.
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A man cannot marry two sisters simultaneously
In Islam, it is considered haram (unlawful) for a man to marry two sisters simultaneously. This prohibition is derived from the Quranic verse in Sura An Nisa (4:23), where Allah states, "Forbidden to you is that you join two sisters in wedlock at the same time." The interpretation of this verse is clear, and it applies regardless of whether the sisters share both parents, only one parent, or have different mothers, as indicated by the following hadith:
> The Messenger of Allah (peace and blessings of Allah be upon him) forbade marrying a woman and her paternal aunt, or a paternal aunt and her brother's daughter, a woman and her maternal aunt, or a maternal aunt and her sister's daughter, or an older sister and the younger sister, or a younger sister and the older sister.
This prohibition is further reinforced by the following hadith:
> Fayruz Ad-Daylami said: I came to the Prophet (peace and blessings of Allah be upon him) and said: O Messenger of Allah, I am married to two sisters. The Messenger of Allah (peace and blessings of Allah be upon him) said: “Choose whichever of them you want [i.e., and divorce the other].
Therefore, it is evident that Islam does not permit a man to marry two sisters simultaneously, and one would have to divorce one of the sisters if they wished to marry the other.
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A man can marry his sister-in-law if her marriage with his brother has ended and her waiting period has lapsed
In Islam, the rules regarding marriage are very clear. God has outlined the women that Muslim men are prohibited from marrying, as described in Surat an-Nisa: [4:22-23]. These include one's mothers, daughters, sisters, aunts, nieces, mothers-in-law, and step-daughters, among others. Additionally, Muslim men are not permitted to marry married women, as stated in [4:24].
However, there is no explicit mention of a brother-in-law's sister in these prohibitions. According to the general ruling of [4:24], which states that "lawful to you are [all others] beyond these," it can be interpreted that marrying a brother-in-law's sister is permissible in Islam. This interpretation is further supported by the absence of any directly analogous variations on relationships through marriage mentioned in the Quran.
Furthermore, in certain circumstances, it is permissible for a man to marry his brother's widow or divorced wife, provided that the marriage between his brother and the woman has ended and her 'Iddah' (waiting period) has lapsed. This is mentioned in the Quran, where it says, " [4:22] And do not marry those [women] whom your fathers married, except what has already occurred." This indicates that while it is generally prohibited to marry a woman who was previously married to one's father, there may be exceptions in specific cases.
It is important to note that while these interpretations suggest that marrying a brother-in-law's sister may be permissible, there are cultural and familial considerations to take into account. In some families or cultures, such a marriage could be seen as inappropriate or causing disharmony between the families involved. Therefore, it is essential to seek guidance from religious scholars or counselors who can provide personalized advice based on specific circumstances.
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Frequently asked questions
It is not explicitly forbidden in the Quran for a woman to marry her brother-in-law. However, the Prophet (peace and blessings of Allah be upon him) forbade non-mahrams (unrelated men) to enter upon women, stating, "Beware of entering upon women. [...] The brother-in-law is death!".
While there is no explicit prohibition in the Quran, it is generally advised against due to the potential for spoiling relationships between families.
Yes, as soon as the marriage between the woman and her husband ends through divorce or death and her ‘Iddah (waiting period) lapses, it becomes permissible for the brother of her ex-husband to marry her.
Yes, as stated in the Quran, " [...] And lawful to you are [all others] beyond these [married women], [provided] that you seek them [in marriage] with [gifts from] your property, desiring chastity, not unlawful sexual intercourse."














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