Then, marrying off his daughter to MINAMOTO no Yoshitada, who was a son of MINAMOTO no Yoshiie, Masamori came to be in a position to exert influence over the Kawachi-Genji clan, as the father-in-law of Yoshitada.
その後、源義家の子、源義忠に娘を嫁がせ、義忠の岳父として河内源氏に影響力を及ぼす。