Hiya Kimberly, and welcome to planDisney! It sounds like you are planning a fun-filled family vacation with your sister; I'm sure the cousins are super excited to explore the Most Magical Place on Earth together!
Kimberly, as Florida residents, your parents have access to some
special perks and discounts on tickets and passes for themselves. To take advantage of this, guests must be able to provide
proof of Florida residency to activate the tickets. Disney now provides Florida residents the option for
Digital Residency Verification to streamline the process when purchasing these tickets for themselves; rather than visiting with Guest Relations to activate, they can head straight to the magic!
After checking in with some fellow panelists and chatting with a Cast Member, the process for guests under the age of 18 does still require in-person ticket activation at the theme parks; so the grandparent would have to be present with the children to verify residency on their behalf before they would be able to activate and use their Florida resident theme park tickets. I hope this helps you make the best choice for purchasing tickets for your upcoming trip!
As you make your plans, be sure to keep an eye out for additional
special offers and discounts available to guests; my own family just booked a dining package with the
Disney+ subscriber offer for this summer! Also keep an eye on the
Disney Parks Blog for all the new and exciting announcements about visiting the Walt Disney World Resort in 2024! It's going to be a magical year, for sure!
See you real soon,
Alison