His older brothers include MINAMOTO no Kuninaga and MINAMOTO no Mitsuhira, and his children include Mitsufusa (Hachijoin Kurodo) and Mitsusuke NAGASAWA (Dewa no kuni no kami [Governor of Dewa Province]).
兄弟に源国長、源光衡があり、子に光房（八条院蔵人）、長沢光助（出羽国守）がある。