Musannaf Ibn Abi Shaybah 33375 — When he leaves his grandfather

Ibrahim said: For a man who leaves behind his grandfather, his full sister and his paternal brother, according to the judgement of Sayyiduna Zayd (may Allah be pleased with him) two fifths of the wealth, that is, four shares out of ten, are for the grandfather, half of the wealth, that is, five shares, is for his full sister, and one share is for his paternal brother. In the judgement of Sayyiduna Zayd (may Allah be pleased with him) the paternal brother returns to the full sister. Her due was three fifths of the wealth, so she was given half of the wealth, because three fifths of the wealth are more than half, and the portion of a single sister is not more than half of the wealth, even if a brother shares with her.