Question: Who is Frances Percy, Duchess Of Northumberland's paternal grandmother?
Sentence (from "Frances Percy, Duchess of Northumberland"): Frances Julia Percy, Duchess of Northumberland (21 December 1752 – 28 April 1820), formerly Frances Julia Burrell, was the second wife of Hugh Percy, 2nd Duke of Northumberland, and the mother of the 3rd and 4th Dukes.
Relevant evidence: No