Kharijah bin Zayd (may Allah have mercy on him) narrates from his father that the meanings and principles of these inheritance shares are from Zayd bin Thabit (may Allah be pleased with him), and the explanation of these meanings is from Abu al-Zinad (may Allah have mercy on him). He said: He would not make uterine brothers heirs alongside children, son's children, the father or the grandfather (whether the children or son's children are male or female); he would not make full brothers heirs alongside a male child, a son's male child or the father; and he would make paternal half-brothers, when none of the full siblings are with them, equal to full brothers in inheritance. When full brothers and paternal half-brothers come together and there is a male among the full siblings, then the paternal half-brothers have no inheritance alongside him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12280