Today I encouraged First Son to jump in the van and crawl across to his seat through the door on his sister's side as I was buckling her in. Instead, he ran around to the other side. As I was calling to him "That door isn't open," he unlatched it and pulled it open. Easily.
I had no idea he could open the van door!
I wonder if our van has child locks to keep him from opening it from the inside...Maybe it doesn't matter yet because I'm pretty sure he can't get himself out of his car seat.
But I was very sure he couldn't open the van door...so perhaps I should check up on these things.