The following highlights come from US Census Report Multigenerational Households: 2009-2011: 

There were more than 76 million family households in the United States. Of these, about 4.3 million (5.6 percent) were multigenerational households. 

Hawaii had the highest percentage of multigenerational households, accounting for 11.1 percent of all family households in that state. 

More than 85 percent of states where the percentage of family households that were multigenerational exceeded the national average were in the South or West. 

Among multigenerational households, the majority (64.6 percent) included a householder, a child of the householder and a grandchild of the householder. Thirty-four percent contained a householder, a parent or parent-in-law and a child. Only 1.7 percent contained a parent or parent-in-law, a householder, a child of the householder and a grandchild of the householder. 

The percentage of family households that were multigenerational ranged from 3.7 percent for non-Hispanic white alone households to 13.0 percent for Native Hawaiian and Other Pacific Islander alone households.        

read … Multigenerational Households: 2009-2011

PDF: Poverty and Shared Households by State: 2011 

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