An-Nisaa 4:12

Your share is half of your wives’ estate if they leave no child; but if they leave a child, you get one-fourth, after settling the bequests or debts. Your wives’ share is one-fourth of your estate if you leave no child, but if you leave a child, they get one-eighth, after settling the bequests or debts. If a man or a woman leaves neither parents nor offspring[10], but has a brother or a sister, each one gets one-sixth[11]; but if they are more than two, they share in one-third, after settling the bequests or debts, without causing harm to the heirs. This is an instruction from Allah; and Allah is All-Knowing, Most Forbearing.

[10] Kalālah: A person who has no living children or parents; (from iklīl), wreath, as his brothers and sisters surround him like a wreath surrounds the head.
[11] These shares are divided equally between males and females.

And for you is half of what your wives leave if they have no child. But if they have a child, for you is one fourth of what they leave, after any bequest they [may have] made or debt. And for them [i.e., the wives] is one fourth if you leave no child. But if you leave a child, then for them is an eighth of what you leave, after any bequest you [may have] made or debt. And if a man or woman leaves neither ascendants nor descendants but has a brother or a sister, then for each one of them is a sixth. But if they are more than two, they share a third,[167] after any bequest which was made or debt, as long as there is no detriment [caused].[168] [This is] an ordinance from Allāh, and Allāh is Knowing and Forbearing.

[167] These shares are divided equally between males and females. The siblings referred to in this verse are from the mother's side only. Those from
the father or both parents are mentioned in Āyah 176.
[168] This is a condition for any bequest. If it has been violated by the deceased, his bequest is not to be honored, or it may be adjusted by the executor. See 2:182.

12. In that which your wives leave, your share is a half if they have no child; but if they leave a child, you get a fourth of that which they leave after payment of legacies that they may have bequeathed or debts. In that which you leave, their (your wives) share is a fourth if you leave no child; but if you leave a child, they get an eighth of that which you leave after payment of legacies that you may have bequeathed or debts. If the man or woman whose inheritance is in question has left neither ascendants nor descendants, but has left a brother or a sister, each one of the two gets a sixth; but if more than two, they share in a third, after payment of legacies he (or she) may have bequeathed or debts, so that no loss is caused (to anyone). This is a Commandment from Allâh; and Allâh is Ever All-Knowing, Most-Forbearing.

And unto you belongeth a half of that which your wives leave, if they have no child; but if they have a child then unto you the fourth of that which they leave, after any legacy they may have bequeathed, or debt (they may have contracted, hath been paid). And unto them belongeth the fourth of that which ye leave if ye have no child, but if ye have a child then the eighth of that which ye leave, after any legacy ye may have bequeathed, or debt (ye may have contracted, hath been paid). And if a man or a woman have a distant heir (having left neither parent nor child), and he (or she) have a brother or a sister (only on the mother's side) then to each of them twain (the brother and the sister) the sixth, and if they be more than two, then they shall be sharers in the third, after any legacy that may have been bequeathed or debt (contracted) not injuring (the heirs by willing away more than a third of the heritage) hath been paid. A commandment from Allah. Allah is Knower, Indulgent.