Mary Young (died 1894) (1795–1894) Parents John Young Children William Addington, 3rd Viscount Sidmouth Leonard Allen Addington Mary Ursula Addington Caroline Penelope Addington Charles John Addington Hiley Robert Addington Louisa Charlotte Addington unknown Addington Frances Sophia Addington Known Addington Partners William Leonard Addington, 2nd Viscount Sidmouth