Something to consider, assuming you'll have a car, is renting a pool home or condo off site. I know, many think that this is sacrilege, but when we went 3 years ago with 2 kids and grandparents we rented a condo at Regal Palms that was just beautiful, had it's own water park, and everybody got their own bedroom including my parents. Plus a nice living space and full kitchen.
Staying on site would have been nicer in some ways, but being able to come home after a long hot day at the parks when everyone was a bit tired and crabby and scatter to our own private spaces for a little while kept everyone sane and really made the trip awesome. I love my parents, and so does my DW, but being stuck in a small hotel room or even suite with them for 10 days would have led to serious family strife, and likely ruined the trip.
Rental homes are often cheaper than hotel rooms, even off site hotel rooms, on a weekly basis, and benefits are more than worth it in my book. Check out
www.VRBO.com or other like sites for prices. Unless you are going at peak times, you can score some very good deals. Yes you have to pay for parking at the parks, which adds up, but that can be more than offset by the savings from having a full kitchen to work with. We mostly just ate breakfasts in , but that alone saved a ton when you're feeding 6. Plus sometimes the kids just need to chill out on the couch for a while and not deal with the stress of a restaurant every meal. Especially with young ones this can be a huge trip saving option. Nothing ruins a Disney vacation faster then over tired, stressed out kiddos.
And honestly, if DW and I don't have a private bedroom, it ain't vacation!