Panel 1: Mike looks like he's about to go Andrea Yates. Deanna looked much the same way a couple years ago. And in both cases, over very minor incidents. I fear for these kids. Really, it's not funny wnen they react this way.
Panel 2: And now he's totally coherent. Granted, younger siblings can develop language skills earlier than the older one did, because they have the older one as an example. Still, it's inconsistent.
Panel 3: Sigh. Old argument. Like "Freedom of speech!" "Doesn't mean you have freedom of speech to call me a poopyhead!"
Panel 4: Mike, why are you letting this continue?!
Panel 5: Oh, poor Mikey. Hey, you know what you could do? Call your sister. No, the other one. She might be at school, but you already called your wife at work. Ask what she does when they get like this. Then put the phone down while she laughs and laughs and laughs.