Inukai Tsuyoshi
Kosaburo Eto was born in Saga prefecture on 20 April 1946, the great-grandson of Eto Shinpei, a statesman during the Meiji restoration, the grandson of Eto Shinsaku, a member of the House of Representatives of Japan and close adviser of Inukai Tsuyoshi and the third son of Eto Natsuo, a member of the House of Representatives of Japan. He left Japan Ground Self-Defense Force Cadet School in Yokosuka without a diploma.