Hi Jason,
Welcome to planDisney!
Looking at your trip date, it looks like you will be arriving just before New Year's Eve at the Walt Disney World® Resort! What a magical way to begin the new year. Right now, however, what you have described is a dilemma! Since I do not know all of the details, I am going to try to share some possibilities.
If you have not been able to modify the reservation online, it sounds like your reservation may not have been booked through Disney or may not have included the children. After speaking with two cast members and because I am cautious, I suggest that you try to get those names added to one or more of your resort hotel reservations (depending on room capacity). If you booked through a third-party site, you will need to contact that site to try to modify the reservation.
The good news is that when booking
advanced dining reservations, you should be able to select guests from your
Family & Friends List or, you can leave the guest names empty and update guests later. I just had a similar issue and, when my dining reservation window opened, I was able to book for the number of guests I needed. I left the guest names blank and updated them later. Be sure to check the details on the
advanced dining reservation booking window. With
Lightning Lane selections, there is an early booking window for
Disney Resorts Collection and other select hotel guests (currently including the Walt Disney World Swan hotel). These are the selections that I want to be sure you can make.
I did speak with a third-party vendor and discovered that they only add adult names to hotel reservations. So, your ability to modify may depend on how you booked the reservation. Now, having said all of this, I am hopeful that you will get it all worked out - magic lives on at the Walt Disney World® Resort!
Jason, I will add one additional tip - consider booking a
Candlelight Processional Dining Package at the EPCOT International Festival of the Holidays Presented by AdventHealth. Your arrival day is the last night of the processional so take a look at the
celebrity narrators! In the spirit of Princess Tiana, I am sending a wish to the Evening Star trusting that you are able to make dining reservations and/or Lightning Lane selections and then let your countdown begin!
Magic and memories,
Donyell