We will be going next month with our (then) 9 month old baby as well as our two other children. We have never done the rider swap before and are curious how it works. Can we do it with our fastpasses? If, say, I make our fastpass+ reservations (we are staying offsite, so we haven't done FP+ yet), and I get a FP for all 4 of us for, say, Test Track, can we get a rider swap so each of us can ride with the kids? How does that work since the older two kids each only have one fastpass? Do they still get to ride twice?