Wow what a great idea! I think it's fantastic, especially in our situation. All my family is in England and DH doesn't have Granparents so our kids have never really interacted with people of over, say, 60. When we went back to the UK 2 years ago it was really hard to get the kids to understand that they had to behave and speak differently to different generations. They couldn't for example say something (amusingly) cheeky to their Great Grandparents but they could their Grandparents...that sort of thing.

Sorry, rambling! I think it's great and I hope you have lots of fun there