Lynn, you are one FANTASTIC grandma!
My aunt did the exact same thing a little while ago, with the exact same family members, so I helped her find the best fit for their group as well.
First step: go to Disney World's official site and enter your specific travel information, so that you get an idea of the options you have, regarding accommodations, as well as budget considerations. Click here for
Walt Disney World's home page, which will allow you to enter your desired travel dates, people in your party, as well as resort hotel preference. I'd search with the hotel only option first, since this will be the biggest variable in the price of your stay. At every level, you'll have the option to select multiple rooms, suites, or a combination in order to best fit your group. FYI, the major difference between Value Resorts and Moderate are that there are pool slides and additional table-service restaurants at the moderate resorts. The greatest difference between Moderate Resorts and Deluxe are additional amenities such as spas and additional dining options, in some cases. Some have closer proximity to parks, as well, which make some more convenient for park hopping. Villas are truly homes away from home, some with full kitchens and washers and dryers in in the units. This will be the best place for you to start in your search for your most magical trip!
After doing a little research, you'll have an idea of how much the room(s) will cost. Next, you can search for options such as Dining Plans (a very smart option), Park Hoppers with or without water parks, and the number of nights you'll stay.
Once you've determined your preferred resorts, please come back and ask me more questions regarding dates for travel, activities and what not to miss for your particular gang! You're sure to have a truly unforgettable, multiple-generation experience! How wonderful!