He also paid for Chris's tuition at PVCC in the 2000s, what did that cost him?
Probably not much. Community colleges have always been a cheaper alternative to university, and they were much cheaper back then.
archive.org doesn't have PVCC's website before 2002 (maybe they didn't even have a website until 2002?), but in 2002 it was $40/credit for Virginia residents. By 2006 (the year he graduated finally) it was $68/credit.
We don't know how many credit he took a semester, but assuming the normal full-time 15 credits 2x/year that works out to <$1200/yr when he started and ~$2000/yr when he graduated.
Given how long it took Chris to graduate though, I suspect he wasn't taking a full course load, so his tuition was probably much cheaper per year.
Incidentally, to show how much education costs have gone up even at community colleges, in-state tuition is now $155/credit there.
Why would the court do that though when Chris isn’t a co-owner of the house?
The court can't force Chris into 14BC, Barb would have to agree to it.
Would the conservator be effectively making sure Chris pays Barb rent?
Yes. Chris' tugboat would go directly to the conservator's account, and he would pay the expenses on Chris' behalf. Chris would not be allowed to manage his own money. All of his access to his bank accounts would be revoked and all his debit/credit cards would be shut down.
He'd likely be handed an EBT card to buy groceries without having to spend his tugboat for that (and have to learn to eat for cheap). He might also get a *very* small allowance in a debit account specifically for that purpose, which he would doubtless blow on some lego.
This will probably happen regardless of where Chris ends up.
He probably will not get a guardian however, as the requirements for incapacitation are stricter. Basically they have to show that (from Virginia code):
(i) meet the essential requirements for his health, care, safety, or therapeutic needs without the assistance or protection of a guardian or (ii) manage property or financial affairs or provide for his support or for the support of his legal dependents without the assistance or protection of a conservator.
This can't just be due to making bad decisions, there has to be a condition involved. Now that Chris most likely has documented crippling mental illness from his evaluations, they can probably assign a conservator. They probably can't assign a guardian since Chris is still able to at least dress himself, microwave a Hungry Man, etc.
I mentioned this earlier, and I also would like to know what happens if Barb's family objects to Chris moving back in. It seemed like they were taking some control over the house/situation at some point and I doubt they did so just so Chris could come back and continue to fuck his mom. He doesn't own the house so if he isn't wanted there then he has no recourse as far as I'm aware. The most I'd expect him to be entitled to is to collect anything there that belongs to him.
We don't know how much control Barb has over the situation. If Barb is still not incapacitated, it's up to her, not them. If Barb dies then Chris is still the heir, not Barb's sister.