The second son: MINAMOTO no Yoshitsuna is the father of MINAMOTO no Yoshinaka, the fifth son, whose grandchild, MINAMOTO no Moritoshi is the founder of the Ishibashi clan and the Hattori clan.
次男：源義綱の五男の源義仲(曖昧さ回避)の孫という源盛俊は石橋氏・服部氏の祖。