Manhattan-born comedian George Carlin (1937-2008) wrote in his bestselling book, Brain Droppings (1997):
 
“The other night I ate at a real nice family restaurant. Every table had an argument going.”
 
The popular quotation has been printed on an ecard.
     
Other family restaurant jokes include:
       
. “Can orphans eat at a family restaurant?”
. “I went to a family restaurant and they refused to serve me a family.”
     
         
Wikipedia: George Carlin
George Denis Patrick Carlin (May 12, 1937 – June 22, 2008) was an American stand-up comedian, social critic, actor, and author. Carlin was noted for his black comedy and his thoughts on politics, the English language, psychology, religion, and various taboo subjects. Carlin and his “Seven dirty words” comedy routine were central to the 1978 U.S. Supreme Court case F.C.C. v. Pacifica Foundation, in which a 5–4 decision affirmed the government’s power to regulate indecent material on the public airwaves.
 
He is widely regarded as one of the most important and influential stand-up comedians: One newspaper called Carlin “the dean of counterculture comedians.”[2]
 
Google Books
Brain Droppings
By George Carlin
New York, NY: Hyperion
1997
Pg. 94:
The other night I ate at a real nice family restaurant. Every table had an argument going.
 
Google Books
The Mammoth Book of Zingers, Quips and One-liners:
Over 8,000 Gems of Wit and Wisdom, One-liners and Wisecracks
By Geoff Tibballs
New York, NY: Carroll & Graff
2004
Pg. ?:
The other night I ate at a real nice family restaurant. Every table had an argument going.
GEORGE CARLIN
 
The Plain Dealer (Cleveland, OH)
‘She started it!’ What to do when siblings fight
By John Campanelli, The Plain Dealer
on February 22, 2009 at 2:42 PM, updated February 22, 2009 at 6:45 PM
“The other night I ate at a real nice family restaurant,” comedian George Carlin once said. “Every table had an argument going.” Bickering and fighting are a part of family life; we all know that. And anybody who thought it was a good idea to have more than one child knows that the battles between siblings can be some of the most heated (and most frequent).
 
Google Books
The Little Book of Humorous Quotes
By Malcolm Kushner
The Little Quote Books (littlequotebooks.com)
2011
Pg. 52:
The other night I ate at a real nice family restaurant. Every table had an argument going. -George Carlin