Musannaf Ibn Abi Shayba 26:63

Ibn Fudayl narrated to us, from Bassam, from Fudayl, from Ibrahim, regarding a woman who left behind her paternal uncles, one of whom was her maternal half-brother. Ali and Zayd judged regarding her that her maternal half-brother receives one-sixth, and then he is a partner with them in the remainder of the wealth. Ibn Mas’ud judged regarding her that the entire wealth belongs to him, and this is because of a cause that exists in the partnership, then his family accepts Islam afterwards. Abu Bakr said: So this, according to the opinion of Ali and Zayd, is out of six shares, and according to the opinion of Abdullah [Ibn Mas’ud], it is out of one share, because it is the entire wealth.