Baby has absolutely no idea what's going on between Tuck and Frank, so he's been ignoring them in favor of listening to Dean.

That makes him happy. As long as he's the favorite and Dean still loves him, then everything is okay. He smiles a little and settles into his seat, putting his seatbelt on. "Is it big?" He's not seen a lot of dicks. He doesn't know if his is big or not.

And he's got another question he's curious about, too, so he twists enough to look over at Frank. "What kind of car were you?"