Question: Who is George Grey, 6Th Earl Of Stamford's paternal grandfather?
Sentence (from "George Grey, 5th Earl of Stamford"): On 28 May 1763, he married Lady Henrietta, second daughter of William Bentinck, 2nd Duke of Portland by Margaret Cavendish, only daughter and heiress of Robert, 2nd Earl of Oxford and Mortimer at Stamford House, Whitehall, and registry office, Westminster, having nine children including:
Relevant evidence: No