L.K.
Hmmmm.....the advise you have received so far is quite different from what I usually do so part of the challenge will be you figuring out what works best for YOU and YOUR family. That said, we have the same trouble with our gang whenever we go o visit my parents - late bedtimes, lots of extra noise, etc. We allow the change while we are away but absolutely do not deviate from our home routine once we are back. It's OK to have the "rules" change when you are away but once home, it's back to our regular schedule again. We go back to the usual time frame, storytime, and bed routine. Our kids generally like getting back to normal!