[He can't quite hide the brief escape of laughter at the unfortunate term, mildly horrified by the idea.]

Yeah, that's... for sure a good thing. Don't use that one.

[They really don't need Regis to be asking more questions than he ought to. He gives it a moment's pause, and then adds, in a more serious tone,]

I don't think he'd mind, you know. If you actually called him that. [....wait] Dad. Dad. If you- nevermind.