Musannaf Ibn Abi Shaybah

Ibrahim, regarding the woman who leaves behind her real sister, grandfather, and mother, said that according to the statement of Hazrat Ali (may Allah be pleased with him), half of the wealth is for her real sister, one-third of the wealth is for her mother, and one-sixth of the wealth is for her grandfather. And Hazrat Abdullah used to say that one-sixth is for the mother, one-third of the wealth is for the grandfather, and half of the wealth is for the sister. And Hazrat Abdullah (may Allah be pleased with him) also used to say that Allah Almighty will not see me in such a state that I give preference to the mother over the grandfather in this matter or in any other matter. And Hazrat Zaid (may Allah be pleased with him) used to give one-third of the wealth to the mother and one-third of the remaining wealth to the sister. In this matter, Hazrat Zaid (may Allah be pleased with him) used to divide the wealth into nine parts: three parts for the mother (i.e., one-third of the wealth), two parts for the sister (i.e., one-third of the remaining wealth), and four parts for the grandfather. And Hazrat Uthman (may Allah be pleased with him) used to divide the wealth among the heirs into three parts: one-third for the mother, one-third for the sister, and one-third for the grandfather. And Hazrat Ibn Abbas (may Allah be pleased with them both) used to say that the grandfather is in the position of the father.