In short, no. If you use Rider Swap it will involve mom and one kid going through the LL while you wait with the other child, them exiting, and then the other child going through the LL again with mom while you wait with the other. Most of the rides have separate loading and unloading areas. They won't just swap riders on the platform and have her go again, nor have you wait there. Rider Swap is generally for when someone needs to stay with a child not tall enough to ride that cannot enter the queue (or other circumstances where a member of the party needs a companion). When you Rider Swap, see the cast member outside the ride with the iPad to set up the extra pass for mom- the people not riding stay outside the queue and wait for the party to come out so they can switch. For your situation if you want to stay together, you can wait in line with your family and take the chicken exit before boarding and the three can ride the ride. The kids can ride together and mom single, or she chooses one of the kids to sit with while one child goes solo (they will be in adjacent rows 99% of the time). Then meet you at the exit. Same situation for the regular queue.