Hi, Sabrina, It sounds like you are planning quite the
Grand Gathering at Walt Disney World! With a Grand Gathering, you can get help with reservations, tickets, and many unique experiences only available through Grand Gatherings.
If you all want to stay together, I would suggest a Deluxe Villa Resort. Click
HERE to see a list of properties and the benefits of a Deluxe Villa Resort. The two-bedroom villas sleep 8, so you still may need to book an additional room to accommodate your entire party. Rooms range from studios that sleep 4 to two-bedrooms that sleep 8.
The Beach Club Villas and Boardwalk Villas are both within walking distance of Epcot and a short boat ride to Hollywood Studios. These might be a good options since you want to be close to the parks.
I hope you and your entire party have a wonderful time in Disney!