COVID-19 and Children Passing Age Limits


We pushed our Disneyworld trip from March 15, 2020 to October 2020.
We have:

A 9 year old that will now be 10 in Oct
A 2 year old that will now be 3 in Oct
A Grandma that graciously said someone else can have her ticket.
Hotel reservations for everyone including Grandma

My question is what should I do for the reservation system that opens June 22nd?

Should I make reservations as is (for a 2 year old + 9 year old + Grandma) knowing the 9 year old and 2 year old will need different tickets at a later date?

Should I transfer Grandma’s ticket to the 9 year old and the 9 year old’s ticket to the 2 year old? And thus eliminate any chance of Grandma getting to go.

Other ideas?

Thank you in advance for any responses.

If you want to leave the options open for grandma to go, leave her in your party and get reservations for those who have tickets as is. This is going to take a call to Disney to resolve but might as well get some of your party locked in.

If you are sure grandma isn’t coming, swapping the tickets down should work.

My experience with Disney (whether it be dining reservations, fastpass, boarding groups, etc.) is that if you have most of the details locked down and paid for they will usually accommodate minor changes (like modifying a ticket from child to adult or adding someone to your party). But if you are coming in with a blank slate your options will be more limited.