Hi Brigitte!
Thanks for your question. I love that
Disney understands that many families travel with little ones, and do their best to accommodate that Mother or Father who wants to experience an attraction, but can't do so due to their child's age or height limitations. Disney introduced the
Rider Switch program specifically with the caregiver in mind, that they also can enjoy the magic of Disney as much as any other guest. This is the type of thoughtfulness that separates Disney from any other vacation experience you will find in this world.
So on the attractions that use
Rider Switch, Party 2 (the party that stays back with the small one while Party 1 gets on the attraction) can
bring up to 2 guests when it's time for them to get on the attraction. That can be any 2 people who meet the height restriction, including Party 1 members that just got off the attraction, so long as there's a caretaker that remains back with the child. So this can absolutely be a child, a nephew, a friend, or any member of your party you want to come! Cool huh?
Hope this answers your question. Wishing you and yours a magical time when you visit
Disney World!
Terry