When we went in June, we would go to the fastpass entrance and DH or I would hand them our passes for the adult who was going to ride at that time and tell them we needed to childswap. THey would give us a fastpass childswap ticket to use when the rider came out of the ride. It was good for up to 3 or 4 people I think. THis let my two older kids (6 and 7) ride each of these rides twice back to back, once with DH and once with me. It was great!
Tricia