Hello Luke. Welcome to planDisney!
Thanks for bringing your question to us. I’m so glad to hear you’re planning an upcoming trip to the Happiest Place on Earth. It’s a bummer your cousin is unable to go with you for her birthday celebration. But yes, Luke, you're able to bring another lucky person with you to the Disneyland Resort theme parks.
Unfortunately, you can’t change the name on your theme park tickets on your own. To reassign a Theme Park ticket, you will need to speak directly with a Cast Member by
calling Disneyland Resort Technical Support at (714) 520-6222 or Disneyland Ticket Services at (714) 781-4636. Your patience is greatly appreciated as Cast Members are working diligently to ensure you and all Guests have the best experience. As you know, during the initial phased reopening of Disneyland Park and Disney California Adventure Park, only California residents are allowed to visit the theme parks based on state guidelines. Cast Members at the entrance may require Guests to present valid identification to show proof of California residency. Therefore, it will be important that the name on your ticket matches the name on your identification card.
I hope this information is helpful. As you continue planning your upcoming trip, please don’t hesitate to
write us again if you have further questions!
See ya real soon,
Kiki