Coming up in the third act, the children have already had their tonsils out. They have sore throats.
Molly: It hurts, doesn't it?
Carl's throat hurts too.
Molly: I know it hurts. But it'll be better tomorrow.
Carl still wants a surprise.
Molly: In the meantime, what would you like?
Carl: A surprise.
The next day someone comes to visit the children.
Molly: And here he is.
Who comes to visit?