Hello, Shannon!
Welcome to the Disney Parks Moms Panel! Your dad is welcome to request
Disability Access Service (DAS) at any theme park Guest Relations Lobby and speak to a Cast Member who can offer the best advice based on his needs. If assigned, DAS will allow your dad and up to 5 Guests to obtain a return time to an attraction. While you wait, you can have a snack, shop or experience another attraction. You can get another DAS return time after completing that attraction and so on up to park closing. Once assigned, DAS is good for the entire length of your visit.
If you find your dad needs additional help, there are
Wheelchair and
EVC Rentals available in each theme park and Disney Springs. Many queues are wheelchair/ECV friendly, so he can remain in the chair while waiting in a queue, which may allow him to reserve some energy so he can spend more time you in the parks.
I hope you make many magical memories with your dad during your visit. Please let us know if we can be of further assistance!
Missy