Jonathan has been teaching the girls to play chess. I am not sure how much they really understand yet, but they do know that the object of the game is to guard your king. He plays with them and helps them decide the best moves to make.
When he's not around, they play together and tell each other what to do. They don't ask Mommy, because she's no help, having never mastered the game herself. Maybe they can teach me one day!