More than 4.3 million, or 5.6 percent, of the 76 million family households in the U.S. today are multigenerational households, or families living together that include a grandparent, parent and children as well as other family members, according to a study by the U.S. Census Bureau's American Community Survey.
3.7% in 2000
4.0% in 2010
5.6% in 2012
There was only a gain of .3% in the 10 years between 2000 and 2010, but a gain of 1.6% in the next two years.
That small 1.6% increase represents a decrease in demand of 1.216 million homes.
However, those survey results are for three generations and thus do not include all the kids graduating from college, with no job, and moving back home.