When it comes to sharing a home, more Americans are keeping it all in the family: living with three or more generations under one roof. Households with children, parents and grandparents – so-called “sandwich generation” homes – represent 4.3% of all households, according to the latest U.S. Census data. That’s up from 3.6% in 2006.

In honor of National Parents’ Day on July 24, Trulia took a closer look to see what was behind the trend and found two big factors. First, economics: many families consolidated to make ends meet in the wake the of the Great Recession. Second, America’s changing demographics: multi-generation homes are more common among Asians and Hispanics – two of the fastest-growing U.S. populations.

Finally, we found the biggest concentrations of sandwich homes across the country – from high rent areas in and around Chicago, Long Island, N.Y. and Philadelphia to ethnic enclaves of Miami, Los Angeles and Honolulu.