The other day I asked K what language she thinks Baby Boy speaks.
After a moment's thought, she said confidently, "English."
"So you think our baby boy speaks English?"
"Yes. And Czech. *pause* Wait, I'm silly - babies can't talk! He says 'waah, waah'."
"Of course, you're right, babies can't talk. But we can talk to him, and we can use English and Czech. And Apo Slovak. We will have to teach the baby how to talk."
I like how K saw through my 'trick' question (I didn't really mean it that way, though). She seemed pretty certain that baby boy will be a strong English speaker like her, and she liked the idea of helping teach him to talk - in all three languages.
No monolingual babies in this house, it seems!