Because Sueto was adopted by MINAMOTO no Shigetoki, a descendant of Mitsumasa, he came to be called a descendant of Seiwa-Genji Mitsumasa lineage, but Sueto's father by blood is unknown.
季遠が満政流の源重時の養子となったことから清和源氏満政流といわれるようになるが、季遠の実父は不明。