Hi Gregory,
I love going on big trips to the Walt Disney World Resort with extended family! I have done this five times and have had a great time touring the parks with them.
You do not mention how many people you have but I would look at the
Deluxe Villas. These villas can hold large number of guests in one space. There are separate sleeping areas, full kitchen, multiple bathrooms and washer/dryer units. While they may seem more expensive, you can reduce your budget in other areas to off-set this cost.
When we stay in one of the villas, we order groceries from an online grocer like the Garden Grocer. This saves on our food budget by allowing us to have breakfast, lunch, snacks and drinks all shipped to our room. We then bring this into the park to reduce our food budget. We generally only eat dinner in the parks which is a big savings. The washer/dryer saves on bag fees if we are flying. By packing only a carry-on, we do not pay up to $50 a bag one way to the airlines. I really do not mind doing a load of wash on vacation.
If this is still too much, then have one person book all the rooms and ask for adjoining rooms. While there is no guarantee, Disney does its best to make it happen.
Wishing you a magical vacation!
Beth