Jami` at-Tirmidhi 2094

Al-Harith narrated that 'Ali said:"You recite this ayah: After payment of legacies he(or she) may have bequeathed or debts, without causing harm. And indeed the Messenger of Allah(S.A.W) judged the debt before the will and that the children (sons and daughters)from the same mother and father inherit,not the sons from various mothers. The man inherits from his brother from his father, and his mother, not his brother from his father. Another chain reports a similar narration