Hisham bin Urwah (may Allah have mercy on him) narrated from his father that he was asked about a boy whose mother was a slave woman and whose maternal grandmother was free. When the boy died, he said: "His maternal grandmother will inherit from him."
Hadith Referenceسنن سعید بن منصور / كتاب ولاية العصبة / 1327
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 150، وعبد الرزاق فى «مصنفه» برقم: 19105»