Catherine Hyde, a daughter of Henry Hyde, 4th Earl of Clarendon. They had two sons, who both predeceased him: Henry Douglas, Earl of Drumlanrig (1722–1754) Charles Douglas, Earl of Drumlanrig (1726–1756) References External links 1698 births 1778 deaths Members of the Privy Council of Great Britain 103 Charles Douglas, 3rd Duke of Queensberry Keepers of the Great Seal of Scotland Lords Justice-General Fellows of the Royal Society Marquesses of Queensberry Freemasons of the Premier Grand Lodge of England Dukes of Dover Peers of Scotland created by Queen Anne