Yoshihiro had originally been on good terms with the second brother Yoshikata, and he and Yoshikata went to Kanto at about the same time, threatening their eldest brother Yoshitomo's sphere of influence with their cooperation.
義広は初め同母の次兄・義賢と親しく、義賢とほぼ同時期に関東に下向し、協同して長兄・義朝の勢力圏を脅かした。