This situation sounds a lot like mine, in which I'm the nephew. My aunt was concerned about my differences, which I didn't understand at the time to likely be a form of autism. Why don't I socialize and deal with all the dating stuff that's apparently required to live a normal life? Is something wrong? Am I in trouble or possibly a danger to myself? Will I turn out like Adolf Hitler or Ted Bundy? I appreciated her concerns, but I guess things turned out OK in spite of everything. Just remember that sparse contact in adulthood has a different meaning now that you know what you know about him. I would have been better equipped to make use of what people were trying to do for me if I had known about AS back then.
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A boy and his dog can go walking
A boy and his dog sometimes talk to each other
A boy and a dog can be happy sitting down in the woods on a log
But a dog knows his boy can go wrong