The mother of Tachibana no Toyohi no Sumera Mikoto was Kitashihime, a daughter of SOGA no Iname, and the mother of Anahobe no Hashihito no Himemiko was Oane no Kimi, another daughter of Iname; therefore, Umayado no Miko had a close blood relationship with the Soga clan.
橘豊日皇子は蘇我稲目の娘蘇我堅塩媛（きたしひめ）を母とし、穴穂部間人皇女の母は同じく稲目の娘小姉君（おあねのきみ）であり、つまり厩戸皇子は蘇我氏と強い血縁関係にあった。