Where the second adult and child wait depends on the ride. Ask the CM at the entrance to the line, and he or she will direct you to the proper place. Ususally, but not always, the second adult just waits near the exit. The CM will give first adult a ticket (and write something on the back of it) when he/she goes through the line. After riding, that adult gives the ticket to the second adult, who can then take up to 2 family members with him/her. We used the "swap" with the Fast Pass and so had no waiting for second turn. The kids thought it was awesome!!