That link clarified it nicely, thanks Tallulah. Ds is definitely egocentric. I would have thought he wasn't since he can read upside down or sideways, and he seems to understand family relationships (although he could be parroting what he's heard). But sometimes when he's on the phone he'll hold the phone up to a drawing he's working on to "show" his grandma, and he expects they can see it.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar