Question: Who is John Bourchier, 1St Baron Berners's maternal grandmother?
Sentence (from "John Bourchier, 1st Baron Berners"): Bourchier was the fourth son of William Bourchier, 1st Count of Eu, and his wife Anne of Woodstock, Countess of Buckingham, daughter of Thomas of Woodstock, 1st Duke of Gloucester.
Relevant evidence: Yes