Hey there, Tim! Welcome to planDisney. I hope your visit to Disneyland Resort vacation was full of magic!
I'm sorry to hear that your brother wasn't able to join your vacation recently. I'm happy to share that as long as a ticket is wholly unused, you will be able to use it at a future time until the expiration date. If it is multiple one-day tickets, you will be able to distribute them as you please to whoever, just get the ticket ID numbers from your brother and you will be able to link them to your Disney account. If they are already linked, you are good to go. If the ticket is a multi-day ticket, obviously only one of you will be able to use that ticket, but it will still be helpful for your next trip.
I do want to mention that if it is single-day tickets, you may run into issues reserving your new dates if they are for lower-tiered days. You would then need to
upgrade the tickets to the higher tier to be able to reserve the dates.
I recommend a visit to the parks during the
holiday time if you can make it happen. The decorations are up, the holiday music is playing, and there's a whole lot of celebrating happening throughout the parks and the resort.
Tim, thanks again for stopping by planDisney. We hope to see you real soon!
Carrie