So if a child lies about things, does that mean they have a theory of mind? I remember hearing that it's actually good when a child starts lying, because it means that they are developing cognitively. DS was around 4, I think DD was younger.

My mathy decoder loves non-fiction or anything that is as stupid as possible. So Captain Underpants, The Dumb Bunnies, any kind of joke book. Teacher says that of all the kids in the class, he's the one who really laughs at the humor in books and appreciates things the other kids don't get.

But he doesn't really like fiction that much. Or it could just be an aversion to anything that doesn't have pictures on every single page.
He read a fiction chapter book the other day with hardly any pictures, without me asking or nagging, all on his own. I was shocked. It just takes some kids longer I think. And others will never really get into fiction.