make sure your clean water hose is used only for that, get another hose, different color, for all other uses, especially for flushing our the black water tank.
15 amp, 30 amp, and/or 50 amp adapters--as needed to convert your power cord to what ever outlet you are trying to plug into.
2x on the surge protector and water pressure regulator
checklist for setting up and especially for tearing down, it is easy to get side-tracked by children (We had 3 children also and all of them wanted to help--"Me do it"
), other campers who want to visit or worse yet want to help. I know they mean well, but I have a set routine and I do not let anyone interfere with it. DW takes care of the inside stuff and I do the outside--for some reason she dislikes messing with the sewer hose
2xx on toys for when it is raining or other things happen.
Good luck and hope you have a joyous time