Behind the front doors of U.S. households, reported the Bureau of the Census last week after nationwide samplings, live such statistics as these:
¶Of the nation's 42 million families three-fifths are married couples living with their children or other relatives; the average married couple had two children living at home.
¶Only 2% of U.S. married couples now put up lodgers or resident employees.
¶Families with children move oftener than families without children.
¶Over a five-year period the number of Americans living alone has increased by one-third. "Most of the persons living alone were women and, in particular, widows. There were...