Hi Brooke,
How wonderful to be coming to Walt Disney World with a large group! Let me offer you a few tips for planning such a trip.
First, ask everyone in your traveling party to order and view the
Walt Disney World planning DVD. This is available free of charge, and can give everyone an idea of which parks and attractions they are interested in. From there, you can build an itinerary of which park your group will visit on each day. It is great that you have four days of Disney theme park tickets with the park hopper option. You may find that your party wants to go to all four Walt Disney World theme parks: Magic Kingdom, Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom. You may also find that there is a theme park that no one in your family is interested in, which is fine - you will be able to find plenty to do at the other theme parks for multiple days!
For a large group with a wide spread in ages, I suggest that you head to a theme park together in the morning, experience some attractions that you all want to do, and have lunch. After lunch, I suggest that you allow the group to split up. Some of the youngest members may need to go back to the resort and take a nap, and during this time some of the thrill-seekers can experience more thrilling attractions. You can all come back together for dinner or to take in a nighttime spectacular at one of the theme parks to talk about your day.
Do be sure to make
Walt Disney World dining reservations, especially for meals that you will all eat together since you are a large party.
I would love to help you plan more Brooke; however, I am limited in the space that I have to answer. Please do write back if you have any further questions!