Mitsutsune's second son Mitsusuke later resided in Nagasawa, Ecchu Province, and continued his family line by the name of Nagasawa, and Mitsukuni NAGASAWA was one of the known descendants who lived in the Sengoku period (period of warring states).
後代、次男光助が越中国長沢に居住したことからその子孫が長沢氏として存続し、戦国時代(日本)には長沢光国などを輩出している。