But if they have a child...

But if they have a child, then you shall have a fourth of what they leave after (the payment of) any bequest they may have bequeathed or a debt; and they shall have a fourth of what you leave if you have no child, but if you have a child, then they shall have an eighth of what you leave after (the payment of) a bequest you may have bequeathed or a debt.

And if a man or a woman leaves property to be inherited by neither parents nor offspring, and he (or she) has a brother or a sister, then each of them two shall have a sixth, but if they are more than that, they shall be sharers in a third after (the payment of) any bequest that does not harm (others). (This is) an ordinance from Allah and Allah is Knowing, Forbearing." Inheritance of…