was a son of Reverend Henry Addington , 2nd Viscount Sidmouth , the eldest son of Prime Minister William Leonard Addington and 1st Viscount Sidmouth . Sidmouth was the son of Reverend Henry Addington , 2nd Viscount Sidmouth , eldest son of Prime Minister William Leonard Addington and 1st Viscount Sidmouth .
merupakan anak kepada Pendeta Henry Addington, Viscount Sidmouth ke-2, anak sulung Perdana Menteri William Leonard Addington dan Viscount Sidmouth ke-1. Sidmouth merupakan anak kepada Pendeta Henry Addington, Viscount ke-2 Sidmouth, anak sulung kepada Perdana Menteri William Leonard Addington dan Viscount ke-1 Sidmouth.