The daughter died at an early age like her father, and so Yoshishige was fostered as an adopted child of the daughter of FUJIWARA no Atsumoto (Fujiwara Shikike [a sub branch of Fujiwara family]) who was considered as a lawful wife of Yoshikuni (there are various theories).
その娘も父同様に若くして没し、義国の正室とされる（諸説あり）藤原敦基（藤原式家）の娘の養子として養育されたという。