Bob was a strange guy in his own right and was extremely clueless about how normal behaviour. There are just things that make little sense in that household if you don't take Bob being another excepcional individual into account.
Bob was a hoarder too, granted, his hoard was more valuable and better put together than his stupid wife and son's but he still had that behaviour and tolerated it with Barb and Chris, he definitely was not a disciplinarian and was fine with everything around going to shit and his son becoming increasingly retarded. There are weird things like how Bob was ok with Chris dressing in clown shirts from Goodwill and eating garbage every day meanwhile he let him spend thousands of dollars in his own lego and plastic children toy hoard, you'd not only have to be old and unmotivated but you must really not even have common sense at that point, specially since he was the one who put bread on the table and handled the finances, a htoughtful person would put priority on his son not going around dressing like a fat retard.
Both Bob and Barb were constantly manipulated and swindled by Chris, what normal person, even if old would be so oblivious and would let themselves be taken for a spin by someone like Chris? Bob and Barb were both convinced Miyamoto was gonna give Chris his own Sonichu game or that the thousands of dollars of spending on videogames at Bestbuy were just a hacker and not Chris. Bob was making excuses for him and believing Chris stories about the Game Place too, it was not just Barb. They both only knew about Chris stealing money after the Joshua Martinez incident.
Bob was a smart guy and his other kids turned out smart too but he was probably on the spectrum himself and was very inadequate in a lot of things, and thats why he was ok with Barb, autismo males and narc bpd women go together like bees and honey. I think Chris got the tism from Bob side but he also got the low iq, and entitled attitude and compulsive behaviour from alcoholic Barb, the ocd collecting tick and overall lazyness he got from both.
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