Sounds Like a Good Soap Opera Plot

Daddy and Fiona are playing when a nearby computer chimes to indicate it's starting up or shutting down or doing something computer-y.

Fiona: What was that?
Daddy: I think it was the computer.
Fiona: I think it was the doorbell.
Daddy: Oh yeah? Who's at the door?
Fiona: It's your brother.
Daddy: My brother? I've never met my brother.
Fiona: Well, your brother is your sister.