Sounds like this schizophrenic dude I used to know. He invited me over, no lights, no running water, he pretty much just sat in a moldy chair listening to a crank radio drinking lukewarm tea all day surrounded by piles of trash, books, and like 400 hats. It was really sad. He ended up having a break, got aggressive with the treatment team, and is in some hospital as far as I know now.

Your brother clearly can't take care of himself. I don't know the Kansas system too well, but here if someone gets hospitalized they're supposed to have a safe place to discharge to. It could be a homeless shelter or an acquaintance's couch for all they care, but you have to have a clean place to go to for a shower and be safe. I mean, people lie all the time to get out, but they tend to listen if a family member or case manager say "hey, they can't go back there!" and better options are worked on. If Kansas doesn't do that, maybe next time he's hospitalized (sounds like there will be), he can go out of state to somewhere a little more helpful?