 He was further honoured on 17 June 1801 when he was created Viscount Cranley, of Cranley in the County of Surrey, and Earl of Onslow, of Onslow in the County of Shropshire.Lord Onslow married Henrietta Shelley (d. 1802), daughter of Sir John Shelley, 4th Baronet, on 26 June 1753.They had four sons and one daughter