New research shows that in the United States, it’s not just adult children moving back into their parents’ homes. In fact, families are “doubling up” in all kinds of ways — to the tune of 663,000 in-laws and other relatives moving in with family in 2013 alone.

At the same time, more “working-age, unmarried or un-partnered adults” are moving in together as roommates in order to afford their housing costs.

All told, 32% of working age adults are now living in doubled-up homes of one variety or another.

It’s time to work on those communication skills to ensure that all adults sharing a household have the most positive experience possible.