Question: Who is Sir Gilbert Heathcote, 3Rd Baronet's paternal grandmother?
Sentence (from "Sir John Heathcote, 2nd Baronet"): Heathcote was the eldest surviving son of Sir Gilbert Heathcote, 1st Baronet, Lord Mayor of London, and his wife Hester Rayner, daughter of Christopher Rayner.
Relevant evidence: Yes