“Siblings: children of the same parents, each of whom is perfectly normal until they get together.”
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Sam Levenson 11
American journalist 1911–1980Related quotes

Miller Newton (1981). Gone Way Down: Teenage Drug-Use is a Disease, American Studies Press, Tampa, FL, pg 66.
Recruiting Siblings into Treatment

“Nothing is normal until you get used to it.”
Ron English's Fauxlosophy (2016)

“We believed in our idea — a family park where parents and children could have fun — together. ”
Source: Killing History: The False Left-Right Political Spectrum and the Battle between the ‘Free Left’ and the ‘Statist Left', (2019), p. 37

“A perfectly normal person is rare in our civilization.”

Source: https://www.goodreads.com/author/quotes/14108295.alexis_karpouzos?page=2

Dana Sparks, Chapter 14, p. 247
2000s, Three Weeks with My Brother (2004)