My group did standby, so they all got in line and I had to show my too-short-to-ride child to the CM at the beginning of the line. DD3 and I went and did some other things while the rest of the group went through the line. When they were done, I took DS5 (who LOVED the ride) back on with me. He and I used the child swap just like a FP. We entered through the FP line when we returned. HTH.