宮澤喜一
Koizumi's son-in-law, Jun'ya Koizumi, became a director general of the Japan Defense Agency and a second-generation member of the Diet of Japan. Koizumi's grandson, Jun'ichirō Koizumi, served as the Prime Minister of Japan from 2001 to 2006 and inherited his grandfather's idea of postal privatization; Jun'ichirō had himself been Minister of Posts and Telecommunications in 1992-93 under Prime Minister Kiichi Miyazawa.