Hi Rick! Welcome to planDisney!
What a fun family gathering you are about to have at the Most Magical Place on Earth! There will be so many special memories made as you make your way around Magic Kingdom Park riding attractions, eating yummy treats, and seeing the gorgeous
Christmas decorations. I'm thrilled for your family!
As you know,
Walt Disney World theme park tickets and
Disney Park Pass reservations are both currently required to enter the theme parks. I just checked the
Theme Park Reservation Availability calendar and there still aren't any reservations available for
Magic Kingdom Park on December 13, 2021.
My advice is to keep checking for a reservation to open up. Sometimes they do! If you see availability open up, snag it right away. You could also try
calling Disney directly at (407) 939-7679 and speaking with a Cast Member to see if there is anything they can do to add your grandson to your party.
I hope you have the best vacation and that a reservation opens up for you, Rick! Please let us know if you have any other questions.
Tabitha