One more thing that I would like to add: Although it sounds like you've been able to breathe a little easier regarding your touring plans, etc - remember that they can be built-in babysitters!!! Do your own thing as a family, do your thing as a whole group, and by all means see if you can't work it so that you and your DH get at least one evening to yourselves! Get a window table at California Grill for the fireworks or heck, even go to a movie in DD if you want. But use them!!! Use them use them use them!!! 
I wish you much luck - it's never easy to plan these vacations, and the more people there are the harder it can be. But you WILL have good times, you WILL have frustrating times - no matter WHO goes.
Have a wonderful trip!

I wish you much luck - it's never easy to plan these vacations, and the more people there are the harder it can be. But you WILL have good times, you WILL have frustrating times - no matter WHO goes.

Have a wonderful trip!