Here's what I think's gonna happen.
When Barb dies, it's gonna be sudden and unexpected. Chris won't let her rot in the house. Once he knows something is wrong, he's gonna call an ambulance, assuming she doesn't die in the hospital.
Final expenses? Bob already took care of that. If he took the time to get the mausoleum plots, he probably also pre-paid for the cremation ahead of time and there's probably already paperwork on file.
When Barb dies, I think there will be a cheap funeral and the only ones I can see attending would be Chris, maybe some of the fellow troon ass-patters he hasn't totally alienated yet, and some weens in driving distance of Charlottesville.
Once Barb's funeral is over and done with, I'm guessing Chris is going to finally leave 14 Branchland Court even before the eviction notices show up. He'll probably take a few days to a couple of weeks to try and pack up what he can take with him and leave the Hoard for good.
Now, what happens next will be dependent on whether or not any weens, ass-patters, or internet white knights like The Captain (if he's still involved with Chris anymore) decide to help Chris out either by foolishly letting him crash at their place or setting him up in some cheapo apartment or trailer in a janky part of town.
If he can get a shitty ghetto apartment or rinky-dink redneck trailer then he's got a fighting chance of barely scraping by and living every month tugboat to tugboat.
If nobody steps in, he's probably just gonna be homeless.