Question: Who is the paternal grandfather of John Mordaunt, Viscount Mordaunt?
Sentence (from "Charles Mordaunt, 3rd Earl of Peterborough"): He was the son of John Mordaunt, 1st Viscount Mordaunt, and his wife Elizabeth, the daughter and sole heiress of Thomas Carey, the second son of Robert Carey, 1st Earl of Monmouth.
Relevant evidence: Yes