According to this genealogy, MINAMOTO no Munesue, a grandson of MINAMOTO no Sueto, who was adopted by MINAMOTO no Shigetoki of the Mitsumasa lineage, became MINAMOTO (OBU) no Tadamune's adopted son and called himself Munesue.
この系譜では、満政流の源重時の養子であった源季遠の孫の源宗季が源（飯富）忠宗の養子となり、宗季と名乗ったとする。