Do we all wait in line together? Can we still use FP? How does it work for a ride where the entrance and exit are nowhere near each others?
How it's normally worked in my experience:
1: Visit cast member at the entrance to the stand-by line. All party members, including the little one, must be present. They will give you a rider swap fast pass.
2: In most situations, one parent will wait in the Standy-By line (or in the FastPass line if you already had one) and experience the attraction, the other parent will wait outside.
3: Once one parent is done, the other parent uses the rider swap pass to enter the FastPass line. In some non-FastPass attractions (for example, Sum of All Thrills), you can hand the pass to a cast member at the entrance to the queue and they will move you to the front of the line.
Usually, you can bring 3 or 4 people along with you on the Rider Swap pass, meaning that some members of your part can take advantage of that and experience n attraction multiple times.
There are some situations like at Space Mountain and Tower of Terror where the whole family waits in line and a true "rider swap" takes place at the load platform. These can be worked around as well - in fact we were able to do Space Mountain using the Rider Swap pass system instead of all waiting in line since our 18 month old was passed out asleep at the time and we wanted to keep her napping while we rode it.
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