It is reported about Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that he was asked about a husband and a full sister. He gave the husband half and the sister half. When he was spoken to about this, he said: I was present with the Prophet (peace and blessings be upon him) when he (peace and blessings be upon him) gave this ruling.
Ahmad recorded it; its chain contains a narrator, Abu Bakr bin Abi Maryam, who suffered from confusion (ikhtilat), and the remaining narrators of this report are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفرائض / 7166