"Anybody home?" joke

I heard this from my uncle John Herbert. You can't offend anyone with it.
A telephone sales person makes a call to an unknown prospect and
a very small, very soft, very quiet, and obviously young person
answers the phone.
Sales person: Hello, may I speak to the man of the house please?
Youngster: (whispering) No, he's busy.
Sales person: Well then, can I please speak to your mother?
Youngster: (in a whisper) She's busy too.
Sales person: I see, how about your brother? Can I speak to him?
Youngster: (whispering) No. He's busy too.
Sales person: (losing patience) Is your sister there? Can I talk to her?
Youngster: (in a whisper) She's busy too.
Sales person: ( by now quite exasperated) What are all these people
doing that keeps them so busy?!!!
Youngster: (still whispering) Looking for me.