Musannaf Ibn Abi Shayba 26:163

Muhammad ibn Fudayl narrated to us, from Bassam, from Fudayl, who said: Ibrahim said regarding a woman who left behind her sister from her father and mother, and her sister from her father, and she had no agnate (asaba) other than them: For her sister from her father and mother is three-quarters, and for her sister from her father is one-quarter, according to the judgment of Ali. Abdullah judged that for the sister from the father and mother is five shares, and for the sister from the father is one-sixth. Zayd judged regarding it that for the sister from the father and mother is three shares, and for the sister from the father is one-sixth, and what remains is for the public treasury (Bayt al-Mal) if there is no clientage (wala') or agnate. Abu Bakr said: This, according to the statement of Ali, is out of three shares, and according to the statement of Abdullah and Zayd, it is out of six shares.