Cheers, Fellow Floridian! Welcome to planDisney.
Before we jump into your question, I've got to point out that no one is ever too old for the Mouse! I completely understand if you don't want to spend the day chasing the grandkids, but as Snow White says - "you are never too old to be young." And the magic is always young at the 'World!
What a wonderful gift of tickets to the Resort for your family! You are more than welcome to purchase tickets for your grandkids with your
Florida Resident discount if they are under 18. You can
verify your residency online during purchase, so you don't need to accompany them to the Parks. Unfortunately, your son and daughter-in-law are not eligible (as I assume they are over 18!) for the Florida Resident discounted tickets if they live out of state.
Before you purchase tickets for your son and daughter-in-law, check the
Special Offers, Deals & Discounts page, as there might be some special magic you can use there, too. Enjoy being Grandad of the Year, David! Head on back if you have any other questions.
Rayna