William Addington, 3rd Viscount Sidmouth British Viscount (1824-1913) (1824–1913) Parents Mary Young William Leonard Addington, 2nd Viscount Sidmouth Children Mabel Addington unknown daughter Addington Ursula Georgiana Addington Alice Mary Addington Herbert Hiley Stafford Addington Eveline Addington Harold William Addington Gerald Anthony Pellew Bagnall Addington, 4th Viscount Sidmouth Francis Charles Bathurst Addington Siblings Charles John Addington Known Addington Louisa Charlotte Addington unknown Addington Frances Sophia Addington Mary Ursula Addington Leonard Allen Addington Caroline Penelope Addington Hiley Robert Addington Partners Georgiana Susan Pellew