Actual, honest-to-goodness conversation with my daughter just now:
Her: It's not very nice of somebody to make fun of my pretend baby sister.
Me: Who makes fun of your pretend baby sister?
Her: My pretend baby brother.
Me: Your pretend baby brother makes fun of your pretend baby sister?
Her: Yes. And that's not very nice.
Me: You're right...that's not very nice at all.