Tadaoki, the son of Fujitaka of the Shugo family of upper Izumi Province, became an adopted child to Terutsune HOSOKAWA, the family head in the end of Sengoku Period, and inherited the Oshu family.
和泉上守護家の藤孝の子・忠興が戦国時代末期の当主細川輝経の養子となり奥州家を継承した。