It has long been my belief that in times of great stress, such as a 4-day vacation, the thin veneer of family wears off almost at once, and we are revealed in our true personalities.
Source: Raising Demons, pt. IV, 1956.
-- Shirley Jackson, (Dec 14 1919-1965), US novelist; She wrote stories dealing with supernatural in everyday settings, for example, The Lottery, 1949.