Peter just sort of...let his son flounder in the world. It always read to me like that whole family was fake in some way, and Elliot was their unintentional magnum opus; just as spoiled, fake, and hateful as the rest of them, only he let it show much more than the others.
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Become a techno-barbarian today and get a free catgirl! You need to kill at least one jew to qualify. Alternatives include foxgirls and regular waifus. She will always be loyal, so treat her good.
Think with your noggin, not your n!ggin'.