 He was related to Lord Falmouth on both his father's and his mother's side, as Falmouth was a grandson of Sir Francis Godolphin and had married Charlotte Godfrey, daughter of Arabella Churchill.Rialton represented Penryn for the remainder of the Parliament and was not re-elected in the general election of 1722.On 16 June 1722 Lord Rialton's maternal grandfather the Duke of Marlborough died, and was succeeded by his daughter Henrietta under a special Act of Parliament.