Musannaf Ibn Abi Shaybah 33355 — A mother, a full sister

And Sayyiduna Zayd (may Allah be pleased with him) used to give the mother a third of the wealth and give the sister a third of the remainder. In this case Sayyiduna Zayd (may Allah be pleased with him) used to divide the wealth into nine shares: a third of the wealth, that is, three shares, for the mother; a third of the remainder, that is, two shares, for the sister; and four shares for the grandfather. And Sayyiduna Uthman (may Allah be pleased with him) used to divide the wealth among the heirs into three parts: a third of the wealth for the mother, a third for the sister and a third for the grandfather as well.