Whose Boy is it?

I was getting Brynna ready to leave the house for lunch with Daddy, and this was the conversation:

B: "Why do we have to have lunch with Daddy?" (Yes, we are in the why phase.)

D: "Because he wants to have lunch with just his girls before his boy comes."

B: Reaching for my belly, "That's not Daddy's boy!"

D: "Oh no? Whose boy is it?"

B: "That's my boy!"

D: "Oh, I see. Well, you'll have to share with Daddy. You'll have to share with Mommy too."

B: No response