I'm lazy, too

Mom: You're just like your father: you're lazy. All you do is stare at that machine. And you're a slob! We tidied up before you got here, and you've already made a mess. Why can't you take that book upstairs?
A.: Because I'm reading it.
Mom: You're reading it now?
A.: I read it all the time.
Mom: Unbelievable! I don't know whom you take after. I mean, your father's lazy but he has redeeming qualities.

[Pause.]

Mom: Unbelievable! Instead of going outside, she's going to stare at that machine. It's just not healthy. Unbelievable.