Matt has always had many little games that he plays with Isidora, but since he has been staying at home with her full time, it seems that the number of games has multiplied exponentially. The best part of their games is that almost all of them involve Isidora being mean in some way to Matt. Well, I think it's funny at least.
Here is one of their newest games. You'll notice that she responds most reliably to Matt asking her to help him up. Also, at the end she says, "Die, Daddy." Silly girl.
In all seriousness, though, Isidora really does love her Daddy.