In the name of Allah, most Gracious, most Merciful.
176. They ask you for a legal decision. Say, "Allah directs about those who leave no descendants or ascendants as heirs. If it is a man that dies, leaving a sister but no child, she shall have half the inheritance. If a woman who left no child, her brother takes her inheritance. If there are two sisters, they shall have two-thirds of the inheritance. If there are brothers and sisters, the male having twice the share of the female. Thus does Allah make clear to you, lest you err. And Allah has Knowledge of all things."
(The Women 4:176)