Question: Who is the paternal grandmother of John Perceval, 4Th Earl Of Egmont?
Sentence (from "John Perceval, 3rd Earl of Egmont"): John James Perceval, 3rd Earl of Egmont (23 January 1738 – 25 February 1822), styled Viscount Perceval from 1748 to 1770, was a British politician.
Relevant evidence: No