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Extended families have never been the norm in America; the highest figure for extended-family households ever recorded in Americanhistory is 20 percent. Contrary to the popular myth that industrialization destroyed "traditional" extended families, this high point occurred between 1850 and 1885, during the most intensive period of early industrialization. Many of these extended families, and most "producing" families of the time, depended on the labor of children; they were held together by dire necessity and sometimes by brute force.

Stephanie Coontz (2016). “The Way We Never Were: American Families and the Nostalgia Trap”, p.25, Basic Books
Extended families have never been the norm in America; the highest figure for extended-family households ever recorded in Americanhistory is 20 percent. Contrary to the popular myth that industrialization destroyed