Question: Who is Isma'Il Ibn Ja'Far's paternal grandfather?
Sentence (from "Ja'far al-Sadiq"): He was a descendant of the Caliph Ali and Fatimah bint Muhammad on the side of his father, Muhammad al-Baqir, and of Muhammad ibn Abu Bakr on the maternal side of his family, Umm Farwah bint al-Qasim.
Relevant evidence: Yes