Alex that is WONDERFUL. I want to drive around very slowly with that playing on a big screen strapped to the top of my van.
Or park in a shopping center parking lot and play that while my kids cavort around inside exhibiting their various levels of behavior.
My oldest being very NT-like but not liking a whole whole whole lot of hardcore interaction and tending to be very literal. My son being almost textbook "Little Professor" Asperger's and currently going through an echolalic phase that makes even me want to muzzle him. My usually very socially adroit three-year-old daughter currently exhibiting something that looks a lot more like classical autism-- she has a sinus infection, screams constantly, clings to me and wants nothing else touching her, is practically nonverbal (despite the fact that she is fully capable of complete, correct sentences when it suits her). My infant daughter grinning and goggling at everything, very sweet and engaging, but won't make eye contact and doesn't want cuddled-- very much like her brother at that age and very much like what the lady who I assume is your mother described.
All this with a huge banner that says something like, "Autism Awareness Wagon" in the back window.
I just wouldn't know what to say to the hordes of onlookers I'm sure we'd attract.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"