William Leonard Addington, 2nd Viscount Sidmouth (1794-1864) (1794–1864) Parents Ursula Mary Hammond Henry Addington, 1st Viscount Sidmouth Children Frances Sophia Addington Louisa Charlotte Addington Leonard Allen Addington Charles John Addington unknown Addington Known Addington Mary Ursula Addington Hiley Robert Addington William Addington, 3rd Viscount Sidmouth Caroline Penelope Addington Siblings unknown Addington Mary Anne Ursula Addington Henrietta Addington Frances Addington Charles Anthony Addington Charlotte Addington Henry Addington Partners Mary Young