In 1746 he was created Viscount Trentham, of Trentham in the County of Stafford, and Earl Gower. Both titles are in the Peerage of Great Britain.

His eldest surviving son from his first marriage, Granville, the second Earl, was also a prominent politician. In 1786 he was created Marquess of Stafford in the Peerage of Great Britain. Lord Stafford married secondly Lady Louisa Egerton, daughter of Scroop Egerton, 1st Duke of Bridgewater.