Normal people can change opinions and grow fonder of something, but with Chris his memory changes on a dime. Even before he completely lost his mind, he's rewritten what happened with Megan in his mind, he actively started to change what happened with Greene Elementary even during the "golden days", and has some mixed feelings about the trolls.
From what little I've heard, Barb is in some sort of rest home now, which would leave the house abandoned. Best case scenario is that someone boards up the house to prevent vandalism and Barb doesn't die before Chris is released, leading to a probate court fight. But either way, the house is a lost cause. Chris' only claim to undivided ownership is if Barb wills it to him and that's assuming he can find a way to keep the payments going...which is going to be hard since he was already financially underwater, has no idea of money management or provide a steady income...and probably doesn't have the self-sufficiency to fight it in court and use every legal maneuver to save the house...and anyone willing to help him has ulterior motives at best.