Sadamune did not have any children and so he adopted Toyofusa UTSUNOMIYA (the third son of Yorifusa UTSUNOMIYA of the Bizen-Utsunomiya clan), patriarch to the Iyo-Utsunomiya clan.
貞宗には子がおらず、伊予宇都宮氏の祖の宇都宮豊房（豊前宇都宮氏の宇都宮頼房の三男）が養子となる。