Especially, there is a confusion about the family tree before Tametsugu who appeared in this "Oshu Gosannen Ki," and there is a description of Shoji (administrator of a manor) of the Miura manor from the generation of Yoshitsugu, a son of Tametsugu.
特に、この『奥州後三年記』に登場する為次以前に混乱が見られるが、為次の子、義次（義継）の代から三浦庄司とある。