Musannaf Ibn Abi Shayba 26:210

Ibn Fudayl narrated to us, from Bassam, from Fudayl, from Ibrahim, from Ali, Abdullah, and Zayd, with the like of the hadith of Abu Mu'awiyah. And he added in it: "And it reached me from Ibn Abbas that he used to consider the grandfather as a father; the siblings do not inherit anything along with him. And he would assign to the husband one-half, and to the grandfather one-sixth as a share, and to the mother one-third as two shares."