I am completely confused about rider swap and I'm sure somebody here can answer my question.... 
We will have 4 kids ages 3 and under who will not meet the height requirements on things such as Splash, Space, etc. We are traveling with my extended family. My plan was to FP these attractions for myself, my parents and my sister to ride together, then use rider swap so MH can ride with my BIL (sis and BIL also have small kids and need to use rider swap). My question is: do MH and BIL need FPs as well when utilizing the rider swap? If they don't have FPs, will they need to get in the regular line (therefore, causing all of us to wait for them)? I hope this isn't too confusing...thanks for any tips or advice.

We will have 4 kids ages 3 and under who will not meet the height requirements on things such as Splash, Space, etc. We are traveling with my extended family. My plan was to FP these attractions for myself, my parents and my sister to ride together, then use rider swap so MH can ride with my BIL (sis and BIL also have small kids and need to use rider swap). My question is: do MH and BIL need FPs as well when utilizing the rider swap? If they don't have FPs, will they need to get in the regular line (therefore, causing all of us to wait for them)? I hope this isn't too confusing...thanks for any tips or advice.