You can start out by telling him that he's a very smart kid. You can also tell him that he has AS. You can follow the news, by telling him that there's a part of his brain that's over-developed. You can also tell him that he's not ret*d, and that he's not sick, or crazy. You can tell him that he's lucky, because some kids with autism don't go to the bathroom, and they sit in the middle of the room, humming the same song, over again. You can also tell him that he will have no problems holding down an ideal job, or living on his own, when he grows up.
That's what my mum told me, a few months after I've found my documents, at the age of fifteen.
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The Family Enigma