Musannaf Ibn Abi Shayba 26:202

Ibn Fudayl narrated to us, from Bassam, from Fudayl, from Ibrahim, regarding a man who left behind his grandfather and his brother’s son (from his father and mother): The grandfather has the wealth, according to the judgment of Ali, Abdullah, and Zayd. Abu Bakr said: This is from one share, which is the entire wealth.