It is reported from Sayyiduna Ibn Abbas (may Allah be pleased with them both) concerning the saying of Allah Almighty, "Allah instructs you concerning your children: for the male, the like of the share of two females" [Surah al-Nisa': 11], that inheritance used to be for the children, and the bequest was for the parents and the near relatives. Allah Almighty abrogated of that whatever He willed: He appointed for male offspring twice (the share of) the female, for the parents one sixth, for the husband one half or one quarter, and for the wife one quarter or one eighth.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12533