Proving He's Serious About This

Ariel: "Mommy?"
Me: "Yes?"
Ariel: "How are you a Mommy?"
Me (tired): "Well, I'm just a Mommy. Your mommy."
Ariel: "But how?"

Hmm.

Me: "Well, one day, I had two little boys. One named Elan - "
Ariel, nodding: "...And one named Batman."