Showa Denko
Her father, Nobuteru Mori, held a seat in the Japanese House of Representatives and founded Showa Denko, a major chemical engineering firm. Her brother, Kiyoshi Mori, was the head of the now defunct Management and Coordination Agency, which would later become the interior ministry. Yoshihide Mori, another of Miki's brothers, served as the chief of the Environment Agency, the forerunner of the present-day Ministry of the Environment.