Where do autistic adults go?

My brother is a 22-year-old autistic man. He does nothing but rock in his easy chair while gorging on an unending stream of snacks and sugar and vegging on his tablet. He refuses to leave the house or do anything useful, and the whole time he stays at home he is incredibly abusive, tearing into everyone and everything around him, particularly my mother who he has under his thumb. He gets everything he wants, and refuses to do so much as wipe his own ass, which he makes my 65-year-old father do for him. As we are legally unable to punish him for ANYTHING, giving him everything he wants is the only way to keep peace in our home. I am scared that when my aging parents die, I will be forced to take care of him for the rest of my life.

So where do other autistic adults go? I'm sure that other families don't put up with this. And I'm worried that no home will take him since he won't so much as take a dump without someone to service him. So what happens to autistic adults when they grow up and their families can't take care of them anymore? 

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