Siblings are mentioned in the Quran in these verses:
[4:11] God decrees a will for the benefit of your children; the male gets twice the share of the female. If the inheritors are only women, more than two, they get two-thirds of what is bequeathed. If only one daughter is left, she gets one-half. The parents of the deceased get one-sixth of the inheritance each, if the deceased has left any children. If he left no children, and his parents are the only inheritors, the mother gets one-third. If he has siblings, then the mother gets one-sixth. All this, after fulfilling any will the deceased has left, and after paying off all debts. When it comes to your parents and your children, you do not know which of them is really the best to you and the most beneficial. This is God’s law. God is Omniscient, Most Wise.
[4:12] You get half of what your wives leave behind, if they had no children. If they had children, you get one-fourth of what they leave. All this, after fulfilling any will they had left, and after paying off all debts. They get one-fourth of what you leave behind, if you had no children. If you had children, they get one-eighth of what you bequeath. All this, after fulfilling any will you had left, and after paying off all debts. If the deceased man or woman was a loner, and leaves two siblings, male or female, each of them gets one-sixth of the inheritance. If there are more siblings, then they equally share one-third of the inheritance. All this, after fulfilling any will, and after paying off all debts, so that no one is hurt. This is a will decreed by God. God is Omniscient, Clement.
[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.
[6:87] From among their ancestors, their descendants, and their siblings, we chose many, and we guided them in a straight path.
[9:23] O you who believe, do not ally yourselves even with your parents and your siblings, if they prefer disbelieving over believing. Those among you who ally themselves with them are transgressing.
[9:24] Proclaim: “If your parents, your children, your siblings, your spouses, your family, the money you have earned, a business you worry about, and the homes you cherish are more beloved to you than God and His messenger, and the striving in His cause, then just wait until God brings His judgment.” God does not guide the wicked people.
[58:22] You will not find people who believe in God and the Last Day befriending those who oppose God and His messenger, even if they were their parents, or their children, or their siblings, or their tribe. For these, He decrees faith into their hearts, and supports them with inspiration from Him, and admits them into gardens with flowing streams wherein they abide forever. God is pleased with them, and they are pleased with Him. These are the party of God. Most assuredly, God’s party are the winners.
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