Disneyworld's Park Hopper Pass

Get you Park Hopper Pass
You can't use two base ticket days on the same day to visit two parks. You will be rejected at the second park. You can leave and re-enter the same park on the same day without the hopper option.
You can add the hopper option to your ticket at any time, up until the end of the last day the ticket is valid (either last day of use, or the last day of the 14 day expiration period, whichever comes first). So if you are there for 5 days, buy a 5 day base ticket. If you discover by day two that you really wish you would have bought a hopper ticket, go to guest relations and add the hopper option to the ticket. If you don't need to hop, you haven't spent the extra money.
You can add any of the add-on options to a base ticket at any time, so long as the ticket is still valid, so I never recommend buying the hopper option unless and until you know you are going to hop. I also never recommend buying the no expiration option until you're close the end of your trip and it's obvious you'll have days left on the ticket. The only exception is if you know you are going to be taking more than one trip and you are buying tickets with enough days to cover both. Then you need the no expiration option up front. There's no use spending more money than you have to. In the OP's case, since they are willing to pay for the add on option, it's definitely easier to let the grandparents buy the base tickets, and then add the hopper option upon arrival..

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