The stem family was made up of a nuclear family and a child's family living in the household. The extended and the multiple families are difficult to find today in America, but do exist in other countries. The founders of the Cambridge Group would be surprised by today's families. Single parent, and homosexual household were almost unheard of in the sixteenth, seventeenth, and eighteenth centuries. The history of the family is very interesting and the future of the family is always changing.
Households change due to economic and physical alterations.
Demography measures and records the ever changing family.