Who was George?

As silly as you may think my inquiry may be I would like to ask about a phrase I heard while watching a Bug's bunny cartoon. In this episode he's playing the piano, pauses to the camera and smirks to say "I wish my brother George were here". Who was "George?
I'm sure when this first aired 50+ years ago-- people got the joke.
It's amazing to me how much of the humor I didn't get when I watched it as a child.
(except for this one). Thanks.

It refers to pianist/showman Liberace's brother George.

A search on Google turned up a site that quotes the line from "The Three Little Bops," 1957, and says it was a reference to Liberace, used in several cartoons:
www.thomasvillecentral.com/ musWB,htm

The link below (URL = members.tripod.com/ ~bugsbunnypage/scripts/hydehare.html) goes to a script for "Hyde and Hare," 1955. Excerpt: "Bugs is playing the piano . . . Because of the candelabra, he does a quick impression of Liberace. 'I wish my brother George was here.'"

I also found that a rapper, Del Tha Funkee Homosapien, has titled his first album "I Wish My Brother George Was Here."