Who inherits the remainder when the mother of the negated child has fixed shares but also residuary heirs (like a paternal uncle or a maternal uncle)?
Chapter on Distant Kindred (Dhawu al-Arham)
Al-Mughni
Book of Inheritance Shares (Farā'id)
Primary text
If the negated child leaves a mother and a maternal uncle, the mother receives one-sixth (or one-third in some cases depending on the presence of other fixed sharers) without dispute, and the remainder goes to the maternal uncle, as he is the residuary heir of the mother according to the prevalent view supporting the mother inheriting the remainder by being the residuary heir of her son. If the mother has residuary heirs (such as her father or brother), the remainder goes to the nearest among them, according to the narration favored by Al-Kharqi. Thus, if the father and brother exist, the father inherits the remainder. If the father is replaced by the grandfather, the remainder is split equally between the brother and the grandfather. If the mother's residuary heir is a son of her sister (nephew), he inherits the remainder after the mother takes her fixed share (one-third) and the brother takes his fixed share (one-sixth).
Supporting text
According to the other narration (where the mother inherits the remainder by *radd* or as *'asabah*), the entire inheritance goes to the mother, as seen in the opinions of Ali, Ibn Mas'ud, and Abu Hanifa, though Ibn Mas'ud attributes it to her being the *'asabah* while others attribute it to *radd*. If the mother has no residuary heirs except her *Mawla*, the remainder goes to the *Mawla* according to Al-Kharqi's chosen narration, or entirely to the mother according to the other narration because she is considered the son's *'asabah*.