William married Lady Emilia Mary Lennox in 1774. Emilia (daughter of General Charles (Lennox), 2nd Duke of Richmond and Lady Sarah Cadogan) was born on 6 Oct. 1731; was christened in in St. George's, Hanover Square, London, Middlesex, England; died on 27 March 1814 in Grosvenor Square, London, Middlesex, England; was buried in Chichester Cathedral, Chichester, Sussex, England. [Group Sheet] [Family Chart]