I've been listening to the Squatch-Watch episode playlist while I worked today, and I think I have a rough understanding about how he keeps getting back to his parent's house. It's not because Janet or Tom like him, or condone him living there: it's because he either breaks into their home, or he gets a ride from someone who doesn't know to go there. Seriously, he doesn't have a room there anymore, he was sleeping in the living room. But, it just kept happening, and they gave up trying to stop it.
The only reason he hasn't done this lately is because of the warrant in Tonawanda.
But Tom fuckin hates Andy, and he's really funny when he goes after Andy and his dumb bullshit.
Also Andy takes morphine for his back problems. That's just fuckin wild to me.