Seishu ANDO was a powerful man of Miuchibito (private vassal of the tokuso) as a Tokuso's vassal, and "Taiheiki" (The Record of the Great Peace) referred to the mother of Toshiaki as a daughter of Seishu, but "Nitta Ashikaga Ryoshi Keizu" (The genealogies of the Nitta clan and the Ashikaga clan) stated her as a daughter of Shigeyasu, who is thought to have been from the clan of Seishu ANDO and was the Saemon-shoi (junior lieutenant of the Left Division of Outer Palace Guards) of Kanra gun jito (manager and lord of manor in Kanra District).
安東聖秀は得宗被官である御内人の有力者で、『太平記』では義顕の母を聖秀の娘とするが、「新田足利両家系図」によると、安東聖秀の一族と思われる甘楽郡地頭の安藤左衛門少尉重保の娘と記されている。