Hi Christine!
Thank you for bringing your question to the Disney Parks Moms Panel!
It certainly sounds like you are getting ready for a big, fun trip to
Walt Disney World Resort. I feel like it's such a great place for groups to travel because there is something for all interests, so you can go separate ways for things and then meet back up for dinners, shows, parades, etc.
As long as you are connected to everyone through
My Disney Experience- "My Family and Friends", you should be able to make
FastPass+ reservations for anyone who has valid theme park admittance. I've been able to make them for a group as large as 13 before. If you're having trouble with this or think there is a mistake with your account, feel free to call a Cast Member at 407-939-4357.
I hope this helps! Please let me know if you have any other questions as you plan.