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This quip, Insanity is Hereditary, was said by Sam Levenson (1911-1980). Levenson hosted his own show "Sam Levenson Show", and was a panelist on "This Is Show Business," "Match Game" and "To Tell the Truth" shows. He was a comedian and writer with books titled "Everything But Money," "Sex and the Single Child" and "In One Era and Out the Other."
The direct quote and his thoughts about it can be found in his memoir In One Era and Out the Other.
Comedian and Author Sam Levenson Dies at 68. (1980, August 28). The Washington Post. Retrieved from https://www.washingtonpost.com/archive/local/1980/08/28/comedian-and-aut...
Levenson, S. (1973). In one era and out the other. New York, NY: Simon & Schuster.