Dogyu's father Sadanosuke also became a vassal of Mitsutaka OYAMA, the sixth son of Yoshiaki MOGAMI, but later suffered kaieki (to forfeit rank of samurai and their properties) of the Mogami family, when his lord Mitsutaka was taken under custody of Tadayo SAKAI.
道牛の父・貞之助も最上義光の六男・大山光隆の家臣となるが、後に最上家の改易に遭遇し、主君の光隆も酒井忠世の預かりとなってしまう。