She's become a veteran at this: hosting her grown children and their families at the villa she rents in Tuscany. We won't go into how some people are really lucky about their vacation deals--she teaches Italian and needs to keep her skills fresh; he's a successful businessman [retired] and can afford to indulge this form of refreshment. Over the years of visits by grown children, other relatives, myriad friends and acquaintances, she has learned how to handle the extended [more than one night] visit.
Her first house rule for her children--two sons, each with a wife and two children--is simple: Keep 'em busy.
Before anybody arrives, she makes the daily plans. When they get there, she shares. Here's her rationale: "We never want a day when they can say, what are we going to do today? Or a day when they are just going to sit around the house and swim in the pool all day. I hand them a calendar when they arrive. It shows them what the plan is for each day. If they don't want to do it, they know in advance what's coming. We can negotiate and make another plan. Of course, they tend to stay with what I'm planning since I go with them and I'm the only one who speaks Italian. That makes it a lot easier for them to take trains to visit other cities, go out to lunch, understand the guided tour at the aquarium in Genoa."
Second house rule: visits are one family at a time: serial visits only, never together.
Her rationale: Too many opportunities for sibling rivalry, resentments over child-rearing practices and misunderstandings among family members. Besides, two sons, two daughters-in-law and four grandchildren would be too many people to get moving in one direction at a specified time.
How do her kids take to this? One comes every year for a week. The other has made the trek to Italy only twice in six years. Their choice.