Hello Nicholas!
Welcome to planDisney with a great question! I am happy to hear that you are planning a magical vacation at the Walt Disney World Resort!
As you are aware, all Guests ages 3 and up are required to have both valid admission and a theme park reservation for the same park on the same date. After
linking tickets to My Disney Experience, you are welcome to make different
Disney Park Pass reservations for the family members traveling with you. I will be visiting with friends in the upcoming months and I was able to select different parks for different Guests on different dates.
Sign in to your Disney account and visit
My Family & Friends to confirm that you are connected to the Guests visiting with you, or that you have added them to your list if you are responsible for their plans. If everyone has a ticket, go ahead and
make Disney Park Pass reservations. The system will guide you to create a reservation party, so all you have to do is select those visiting EPCOT, for example. You will have to make a new reservation for those visiting Magic Kingdom Park. You are able to add and remove Guests from a party as needed.
I hope this information is helpful, Nicholas! Come back to visit us if you have additional questions, we are delighted to help.
Best Disney wishes,
Thiana