Any survival tips?

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O.K. Here's the deal. My grown daughters live at quite a distance with their own families. I don't get to see them more than a couple times a year. One lives in Toronto with hubby and son. The other lives in WV with hubby and two daughters. So the week of the Fourth of July they are ALL coming here! Yep, all of them. The Toronto family will be here the entire week and the WV family will be here the long weekend of the Fourth. There is a grown granddaughter who lives in the same city as we and she is really excited about her Toronto family being here for a week. So she will be here a lot of the time, too. That makes eight people here, three of them seven and under. Now, this is a "granny" house. We live a very quiet life, don't even have cable t.v. and don't have much of a yard. Entertaining children is always a challenge, since I'm disabled and not very energetic. The parents like to find things to do that don't include children, yet I'm not really able to keep the kids for very long at a stretch. So I'm expecting a fair amount of stress from the week. The question is, what can I do to be a good host while preserving my sanity and health?