Musannaf Ibn Abi Shayba 26:169

Yahya ibn Adam narrated to us, he said: Mandil narrated to us, from al-A’mash, from Ibrahim, who said regarding the statement of Abdullah: The daughter receives one-half, and what remains is for the son’s sons and the son’s daughters, for the male the like of the portion of two females, as long as the son’s daughters do not exceed one-sixth.