Your share in the property the wives leave behind is half if they die without an issue, but in case they have left children, then your share is one-fourth after the payment of legacies and debts; and your wife shall inherit one-fourth of what you leave at death if you die childless, if not, she will get one-eighth of what you leave behind after payment of legacies and debts. If a man or a woman should die without leaving either children or parents behind but have brother and sister, they shall each inherit one-sixth. In case there are more, they will share one-third of the estate after payment of legacies and debts without prejudice to others. This is the decree of God who knows all and is kind.
— Quran 4:12