<human>: When I was little, my mom was drunk 24/7.  Throughout that time I was humiliated, scared, isolated and lonely.  One of my few consolations was that someday I would be an independent adult and none of her choices would affect my life.  
   
At some point my grandmother took me in and put her in rehab.  She cleaned up and a few years later and around the age of forty, she had two children with someone, even though they couldn't afford to have either.  One is an autistic little boy.  
It has saddened me how thoroughly her life is fixed around him (she's not happy).  But I'm also in despair and feel great resentment because I know there will come a day when I will have to be his caretaker which is a full-time job.  I absolutely don't want this for myself but I also absolutely don't want him to live in some sort of  home/institution.  What should I do? Anyone taking care of an autistic adult know what it's like?

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Give me the gist of the text in a nutshell
<bot>: I'm going to have to take care of an autistic adult when I'm older, which I don't look forward to and I could use some advice or encouragement.