Hi, Melissa!
Thank you for stopping by. It's a pleasure to help you today, and I hope your son is better now!
If you purchased three individual tickets, you should be good to go in
booking your new reservation dates for the two remaining tickets as long as there's park availability for your new dates.
But if you had a three-day ticket and only used one, you could fall under general e-ticket rules.
Current Disneyland Resort ticket rules state that Guests must use multi-day tickets within 13 days after first use or by the stated expiration date, whichever occurs first.
If you're not sure about the type of ticket you have, you can look at your purchase email or
chat with the Cast Members at (714) 781-4636. They will be happy to help!
I hope this helps you solve this ticket mystery, Melissa!
May the magic be with you,
Julie