Sir George Trevelyan, 3rd Bt., son of Sir John Trevelyan and his second wife, Susanna, daughter and heiress of William Warren of Stallensthorne, Devon, married Julia (died 1787), only daughter of Sir Walter Claverley, 1st Bt., of Claverley, Yorkshire and eventually heiress, of her brother, Sir William Claverley Blacket, 2nd and last Bt.