Sisters are mentioned in the Quran in these verses:

[4:23] Prohibited for you (in marriage) are your mothers, your daughters, your sisters, the sisters of your fathers, the sisters of your mothers, the daughters of your brother, the daughters of your sister, your nursing mothers, the girls who nursed from the same woman as you, the mothers of your wives, the daughters of your wives with whom you have consummated the marriage – if the marriage has not been consummated, you may marry the daughter. Also prohibited for you are the women who were married to your genetic sons. Also, you shall not be married to two sisters at the same time – but do not break up existing marriages. God is Forgiver, Most Merciful.

[4:176] They consult you; say, “God advises you concerning the single person. If one dies and leaves no children, and he had a sister, she gets half the inheritance. If she dies first, he inherits from her, if she left no children. If there were two sisters, they get two-thirds of the inheritance. If the siblings are men and women, the male gets twice the share of the female.” God thus clarifies for you, lest you go astray. God is fully aware of all things.

[24:31] And tell the believing women to subdue their eyes, and maintain their chastity. They shall not reveal any parts of their bodies, except that which is necessary. They shall cover their chests, and shall not relax this code in the presence of other than their husbands, their fathers, the fathers of their husbands, their sons, the sons of their husbands, their brothers, the sons of their brothers, the sons of their sisters, other women, the male servants or employees whose sexual drive has been nullified, or the children who have not reached puberty. They shall not strike their feet when they walk in order to shake and reveal certain details of their bodies. All of you shall repent to God, O you believers, that you may succeed.

[24:61] The blind is not to be blamed, the crippled is not to be blamed, nor is the handicapped to be blamed, just as you are not to be blamed for eating at your homes, or the homes of your fathers, or the homes of your mothers, or the homes of your brothers, or the homes of your sisters, or the homes of your fathers’ brothers, or the homes of your fathers’ sisters, or the homes of your mothers’ brothers, or the homes of your mothers’ sisters, or the homes that belong to you and you possess their keys, or the homes of your friends. You commit nothing wrong by eating together or as individuals. When you enter any home, you shall greet each other a greeting from God that is blessed and good. God thus explains the revelations for you, that you may understand.

[33:50] O prophet, we made lawful for you your wives to whom you have paid their due dowry, or what you already have, as granted to you by God. Also lawful for you in marriage are the daughters of your father’s brothers, the daughters of your father’s sisters, the daughters of your mother’s brothers, the daughters of your mother’s sisters, who have emigrated with you. Also, if a believing woman gave herself to the prophet – by forfeiting the dowry – the prophet may marry her without a dowry, if he so wishes. However, her forfeiting of the dowry applies only to the prophet, and not to the other believers. We have already decreed their rights in regard to their spouses or what they already have. This is to spare you any embarrassment. God is Forgiver, Most Merciful.

[33:55] The women may relax (their dress code) around their fathers, their sons, their brothers, the sons of their brothers, the sons of their sisters, the other women, and their (female) servants. They shall reverence God. God witnesses all things.

To learn more, read the Quran in English.

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