The son and heir of Hirotsugu, Tsuguuji KAWAKATSU served Nobunaga ODA, and in 1573, fought in the attack against Yodo-kojo Castle in Yamashiro Province (the second battle at Yodo-kojo Castle) under his superior Yusai HOSOKAWA who had been ordered by Nobunaga.
広継の嫡男川勝継氏は織田信長に従い、天正元年（1573年）、信長の命を受けた細川幽斎に従って、山城国の淀古城攻め（淀古城第二次淀古城の戦い）に参加した。