Question: Who is the paternal grandfather of William Hay, 17Th Earl Of Erroll?
Sentence (from "James Hay, 15th Earl of Erroll"): James Hay, 15th Earl of Erroll (20 April 1726 – 3 July 1778) was a Scottish nobleman and the son of William Boyd, 4th Earl of Kilmarnock.
Relevant evidence: Yes