Grandparents Buying FL Resident Passes for Grandkids

In past years, my FL-resident in-laws have bought child park passes for their non-resident grandchildren, which is no problem. Two of the non-resident grandchildren are now older than 9 and therefore need “adult” tickets. My question is: Can grandparents buy FL tickets for their non-FL grandkids who are older than 9 but younger than 18? Thanks.