Right now, we're thinking, one carry on with medications, toiletries, and paperwork.. one large suitcase for three sons to share, and one smaller one for each me and husband to share. So, three checked, one carry on. I will put a duffle bag or two in the checked ones, just in case for disney loot coming home.
Each son also has a backpack for airplane entertainment.
I hope it's enough. Three checked bags, for five people. We're light packers though.