Kiyoko is a niece of former House of Representatives Speaker Yoshio Sakurauchi. Seiichi Ota, former director general of the Management and Coordination Agency, is also one of her relatives.

• 福田贵代子是日本前众议院议长樱内义雄的侄女，“管理与合作机构”的前总管太田诚一也是她的一位亲戚。