In addition, his eldest daughter, Sohekimonin gave birth to Imperial Prince Mitsuhito (later became Emperor Shijo), and when the Imperial Prince ascended the throne as the Emperor in October 1232, Michiie gained full power as maternal uncle and his eldest son, Norizane, became the Sessho.
しかも長女の藻壁門院に秀仁親王（のちの四条天皇）が生まれ、親王が貞永元年（1232年）10月に天皇として即位すると、道家は外祖父として実権を完全に掌握し、長男の教実は摂政となった。