Sato's father Shigeyori KAWAGOE, and his brother Shigefusa KAWAGOE followed the army to hunt down and kill MINAMOTO no Yoshinaka, which was the first battle for Yoshitsune, and they also visited the Cloistered Emperor Goshirakawa's palace with Yoshitsune.
郷の父・河越重頼と兄弟の河越重房は義経の初陣である源義仲追討に従い、後白河法皇の御所にも義経と共に参院している。