Imam al-Shafi'i (may Allah have mercy on him) reported that some people of knowledge have held our view on both of them except in one point: when his mother is an Arab woman or has no wala' (clientage), they return the rest of his inheritance to his mother's 'asabah, and they said: His mother's 'asabah are his 'asabah. They took as evidence narrations that are not established, and others that are not fit to serve as proof.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12497