On Yoshiteru's orders he was adopted as a son of Terutsune HOSOKAWA, a member of the Oshu family, but as an adopted son he was not part of the family line and later cooperated with Fujitaka, his actual father, and inherited the fiefdom.
義輝の命により一族・奥州家の細川輝経の養子となるが、この養子縁組は系譜上のものであり、その後も実父・藤孝と行動をともにし、領国も継承した。