Question: Who is the maternal grandfather of Robert Bertie, 4Th Duke Of Ancaster And Kesteven?
Sentence (from "Robert Bertie, 4th Duke of Ancaster and Kesteven"): He was born in Grimsthorpe, the second son of the General Peregrine Bertie, 3rd Duke of Ancaster and Kesteven (died 1778) and Mary Panton (died 1793)
Relevant evidence: Yes