Furthermore, by marrying one of the daughters of Iechika MIMURA who became the lord of the Bicchu Matsuyama-jo Castle, Takatoku deepened his relationship with the Mimura clan who was extending power over the entire Bicchu as well as the Ishikawa clan and the Sho clan, both of whom were serving as Shugodai of Bicchu.
そして、備中松山城主となった三村家親の娘を室とし、石川氏･庄氏両備中守護代家同様、備中一円に勢力を広げる三村氏との縁故を深めていった。