If it's a ride that your 2yo is too small to ride, you can use Rider Swap and then your 5yo will get to ride twice without needing another Fast Pass. Basically how it works is: Your whole party, including the child that is too small, approach the entrance to the line - either standby or FP - and tell the CM that you need a Rider Swap. They'll hand the adult who is going to wait with the child a pass similar to an old paper Fast Pass. Then the group riding first scans their FP or enters the standby line and the other adult and smaller kids can go do something else. After the first group comes off of the ride, the adults swap and the one who waited (plus up to 2 guests) get to use the Rider Swap pass to enter the FP line. And, only the group riding first needs a FP. The RS pass functions as the FP for the second group. So you could do something like this: Mom, Dad, & 5yo have FP for Mine Train. Grandma & Grandpa have FP for the same time for Pooh. Your whole group goes up to the Mine Train entrance and tells the CM you need a Rider Swap. Mom, Dad & 5yo use their FP for Mine Train, while Grandma & Grandpa use their FP to take the 2yo on Pooh. Then Grandma, Grandpa & 5yo use the RS pass to ride Mine Train through the FP line. 5yo makes out like a bandit and is the happiest ever (if yours is anything like mine). We used RS a lot on our trip last month and it worked out really well. You also don't have to use the RS pass right away; the ones we got all had an expiration date of the end of the month printed on them. So you could use them later in the day, or on a different day entirely if you are back in the same park.
