I think Chris was doomed from the start.
My Chris Chan history might be a bit rusty, but you're absolutely right about Bob. I wouldn't exactly call Bob parent of the year, but he made valiant efforts for Chris' development. That shed moment and post mortem letter always put a tear to my end. He's certainly old fashioned, so I surmise that autism was a new thing for him to learn. I think Bob was opening up to Chris' Sonichu as a means of telling Chris' challenges with autism.
Barb was not supportive of Chris; that's pure emotional manipulation. Chris was always a pawn for Barb's tactic, especially after Bob's death. The autism was her meal ticket to feel special again after her several one-night stands. That I didn't know of.
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Sad thing is Chris legitimately loves her Mom, but she does not reciprocal that love. It's easy to say that Chris should just leave Barb behind, but also realize that Chris' dream was always companionship. Moreover, the intentional untreated autism with Barb's meddling kept Chris in check.
Part of me had FELT sorry for Barb at this point because she's a frail, feeble old woman at this point. What CAN you get out of her? Certainly not an apology. However, I believe that Bob got the easy way out with his death. He doesn't have to deal with Barb anybody. He found closure through death. Barb, however, is still "alive" on Earth.
There's a gag on here about when will Barb kick the bucket. I feel that her inevitable time on Earth is a comeuppance for all the manipulation and lying she has pulled onto her family over the years. She has to witness the fruits of her labor with Chris acting amuck. All cooped up with her hoard having to rely on Chris to take care of her while the rest of her family has abandoned her (or is it the other way?) God has a wicked sense of humor sometimes.
This incest act ... I hate to say, but that's a harsh reality that nobody saw coming but the writing was on the wall. (Along with mildew, dirt, grime, shit and God know what else.)
I feel more sorry for Chris than Barb, but he needs to learn that the world won't just abide to his every whim. One way or another, he's going to pay for it.