I have a theory about where narutos family went. not his inner family but his clan. Now if you go back to when oro had the battle royal among his prisoners to find the strongest person to be his new body. Now I seem to remember the winner seemed to resemble naruto alot. Now after he won the contest oro gave him one request which was that his clan be released. So I asume that his clan would most likely have the same features that he shares with naruto. I just say this because this was not really of any importance to the story, What I mean is that we didn't need to know anything about this guy and yet it is there, also this was would have been very overlookable, but I still think it has meaning. I mean oro was testing jutsus on ninjas from the leaf so why ould he still not use the ones he already. also what better way to get back at the guy who stole being hokage from you then kidnap his clan and test jutsus on them.