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One big happy (or unhappy) family is taking on new meaning. Older moms and dads are moving in with their adult children, or the grown kids are moving in with them and those adult children have children of their own. One house: two or three generations. It's called multi-generational housing. And economists tie it to both the down-turned economy and health needs.

It's growth is for real. According to a January 2010 survey of its real estate agents, Coldwell Banker reports that in the past year, there has been a notable rise in the number of home buyers looking to purchase homes to
accommodate more than one generation of their family. Nearly 70 percent of the sales agents see economic
conditions accelerating that trend in the coming year.

Here's how the survey breaks down the reasons behind the multi-generational housing purchases: 39 percent give financial reasons as the number one driver; 29 percent point to health issues; 6 percent cite a strong family
bond.

The emotional issues that tie into such togetherness can be, as comedian Sarah Silverman might say, "beyond beyond." On a more practical level, though, the Coldwell Banker survey has a tip for those preparing to be multi-generational homesteaders:

"Extended families purchasing a
home together should consider signing a written contract outlining
everything from finances to chores and childcare. Each family should
assess their situation individually and find a plan that works best for
them."