Though his mother's name was not recorded, the Gosen Wakashū, an anthology of Japanese poems, mentions the name "Mother of Kiyotada" (清正母). His elder brother was Masatada.
The Gosen Wakashū, a collection of Japanese poems, fails to mention his mother's name. However, it references "Mother of Kiyotada" (清正母). His older brother is identified as Masatada.