What is the inheritance share of a paternal grandmother (mother of the father) when the father inherits?
Chapter on the Roots of Inheritance Shares that Increase (Awl)
Al-Mughni
Book of Inheritance Shares (Farā'id)
Primary text
The paternal grandmother receives one-sixth share, and the remainder goes to the father. This is according to the primary opinion on the grandmother inheriting with her son.
Supporting text
According to the secondary opinion (that the grandmother does not inherit with her son), the entire remainder goes to the father.