Hi there, Jane!
With their own individual tickets, your grandchildren are welcome to go to Walt Disney World with any trusted guardian you choose.
Disney passes are non-transferable. From the
official ticket FAQ:
"Please note that all Magic Your Way Tickets are nontransferable and must be used by the same person on any and all days. The person who uses the ticket for the very first time must use the ticket for its entirety. Any tickets that are transferred are in violation of this restriction and are invalid for admission."
Typically, those Guests 10 and up will be required to use the biometric finger scan to assign an ID to a ticket's magnetic strip; this way, the ticket cannot be transferred from one use to another.One person is linked to one ticket, and any discrepancies might result in the Guest needing to produce ID to confirm his/her identity.
The Cast Members at the turnstiles do reserve the right to ask for ID
when a Guest uses a Florida resident ticket.
All of these security measures, in addition to being used to maintain ticket integrity, help ensure that head counts, among other things, are accurate for Guests' safety
Have a wonderful family vacation!
See you later, celebrator,
-Deborah B.