Meanwhile, Mitsuzumi IWAMATSU (according to "Keizu sanyo", was born to Yoshimune and a younger sister of Mitsukuni IWAMATSU, but there are various views concerning his birth) claimed that he was a son of Yoshimune and was adopted by the Iwamatsu clan.
その一方、一族の岩松満純（『系図纂要』等では義宗と岩松満国の妹との間の子とするほか、出自に諸説ある）も義宗の子と自称して、岩松氏の養子に迎えられたと自称した。