Allah instructs you regarding your children: A male receives the same as the share of two females. If there are more than two daughters they receive two-thirds of what you leave. If she is one on her own she receives a half. Each of your parents receives a sixth of what you leave if you have children. If you are childless and your heirs are your parents your mother receives a third. If you have brothers or sisters your mother receives a sixth, after any bequest you make or any debts. With regard to your fathers and your sons, you do not know which of them is going to benefit you more. These are obligatory shares from Allah. Allah is All-Knowing, All-Wise.