As usual, my freak out was for naught. The party was terrific. I felt like my family finally got to see his best side, or at least his better side. He played with his cousin -- two years younger, a perfect age difference for him. We're talking about trying a sleepover for the two of them. He was also invited to be in on a cookie making party. (Horrors, I hope my family isn't reading this board?! )
He's in such a good place right now. It makes me so happy. He's still his own, delightfully different self, but enthusiastic, participatory, flexible (within reason.) Able to be part of a family.
The biggest issue seemed to be him keeping track of who everybody is. We do talk about who we're going to see, but of course he is faceblind. Maybe I should make a point of showing him who everybody is when they arrive, or we arrive, and point out things he can use to identify them.
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Sharing the spectrum with my awesome daughter.