Anna - Here is an abstract for William Graham's will in 1761. He mentions his brother, Robert Graham. Maybe he's yours. Prove date is 27 Apr 1761 William Graham. 18 Feb 1761. Wife Anne. Dau. Jean, plantation upon Bonney Brook, where the Riggs now live. Granddau.: Anne Graham, a minor. Bro. Thomas Graham. Bro. Robert. Exs., wife and Andrew Holmes. Book and page is A, 84. Jeanne