Hi Ashley,
Absolutely! I recommend that one of you make all of the
Advanced Dining Reservations as the "trip coordinator". When reserving meals, simply book it for the total number of guests in your party. If you are all linked together on
My Disney Experience, you will be able to select each of them for the reservation. This way, they will all be able to see the plans when they log-in to their My Disney Experience. You'll want to note that Advanced Dining Reservations can be made 180-days prior to your arrival, beginning at 6 AM, EST online. You can also call 407-WDW-DINE beginning at 7AM EST to book via the phone. You'll also want to keep in mind that restaurants which are located within a theme park will require a valid park pass for entry, so be sure everyone has purchased enough passes and/or be sure to coordinate plans to dine in a park when you have passes for that day.
It sounds like you have a super fun trip planned with your extended family. Please let us know if we can assist you further.
Wishing you magical memories,
Kaylene