Aimee and Nelson: Visit

We're having a good visit with Bill and Isabel. Grace and Isabel
have been quite a pair, playing together and shrieking with
laughter. Every once-in-a-while, when they get tired, they get in a
spat, in which they are both deadly serious, but it's hard not to
smile while they bicker:

Isabel: "You are mad at me."
Grace: "No, I'm angry."
Isabel: "It means the same thing, Grace."
Grace: "It means I'm a lot madder."