I would find out the place where the bro resides and call them up, outright say "I think Nick Delici may have had his identity stolen a couple years [one year? i have already forgotten and it was mentioned] ago." Would probably be good to mention you follow Phil online, that's how you're aware of Nick's existence (and maybe could get away with knowing where he lives with this), and some posts of Phil's tipped you off that something was up. I don't know what you have exactly, DT, like if legally speaking you should have access to that information, so I don't know if you'd want to bring it up. But tipping SOMEBODY off can't hurt, and if all else fails you could probably contact some government or state agency if it does seem like the care staff/family are in on it.
(p.s. i hate your new name, the auto tagger thing isn't showing up for me and i can't be arsed to look if you have punctuation in your user)