If your grown children and their children are moving back home--out of economic necessity or for a temporary but long-term visit--there are lots of challenges ahead. Here's a blog that's detailing how one family is working things out. I like the tone of it. Here's part of an opener to one recent entry:
"When you invite your children to come back home for whatever reason (in this case a bad housing market) you can’t make them feel as if they are imposing. It is very important to let them know that this is their home now also. With a few simple ground rules laid out in advance, everyone can feel comfortable."