My son has LFA, and my daughter is either very HFA or an NT (she is currently being tested).
My father's first cousin was - from what information I am now gathering - an LFA. I did not know this until literally 2 weeks ago. According to some relatives, she was completely non-verbal, "withdrawn", and had "weird behaviours" (aka stimming). She died young.
My MIL's first cousin has a grandson, who is the *spitting image* of my son. He is 13, and also squats on the lower end of the spectrum like his cousin, my son, but has recently begun to communicate via typing. That gives me a lot of hope that the two of them will migrate up the spectrum together. When they met last year, they studiously avoided each other, and wandered around vocal stimming, flicking their fingers to the corners of their eyes. BUT, it was interesting to note that they were stimming on the same sounds, and when one changed sounds, the other magically followed suit !
Imitation of some sort, aye ? To me, that seemed like an acknowledgement of each other even if - on the surface - they didn't seem to want much to do with each other.
_________________
O villain, villain, smiling, damnèd villain!
My tables—meet it is I set it down
That one may smile, and smile, and be a villain.
At least I'm sure it may be so in "Denmark".
-- Hamlet, 1.5.113-116