Here is a wonderful article, In Praise Of The Broken Home, written and illustrated by Ellen Lupton for the NY Times. From broken to blended, it is the continuing story of the American Family.
Back then, people routinely called families of divorce “broken homes,” yet a new phrase was already coming into play that cast a warmer light on the process of divorce and remarriage: “blended family.” As my own parents regrouped and remarried, they never used this kinder, gentler nomenclature, yet sociologists and psychologists were applying it in the ’60s and ’70s. Today it is common currency. Whereas “broken home” describes the destruction of an original family unit, “blended family” refers to the new marriages that sometimes follow. “Blended family” is about making, not breaking, and it implies a seamless melding of diverse ingredients. (Press “liquefy” on your Osterizer.)