Hi Tiffany,
When you're talking about visiting The Most Magical Place on Earth, it's totally understandable that you'd want all your Mouseketeers with you to enjoy all the fun together.
One key thing to keep in mind about the
theme park reservations you make to visit the Walt Disney World Resort theme parks is that the reservations can't be modified. You can easily make theme park reservations through the
Disney Park Pass system. You can also easily view or cancel theme park reservations using the
My Plans features and the Daily Itinerary tab in your My Disney Experience account.
I think one option for you would be to cancel an existing reservation and make a new theme park reservation. When you choose to cancel a theme park reservation, you can select the Guests for whom you're canceling the reservation. So you could look to cancel the existing reservation for your husband and son, and then make a new reservation for them for Magic Kingdom Park. My suggestion is to always check the
Theme Park Reservation Availability calendar first to make sure the reservation dates you have in mind are available for the theme park you want to visit.
I hope this info is helpful, Tiffany. Here's wishing you all get to enjoy
Magic Kingdom Park together!
Jerry