I have an article I wrote in the Clifton Park Neighbor Magazine for the 5 and under crowd. it is good advice for any planning at Disney but especially good for the 5 and under. Here is the link https://www.silverpenproductions.com/wp-content/uploads/2018/07/CliftonParkNeighbors_Aug18.pdf I am on page 4.
When traveling with younger people it is important to know what their limits are. If you must them too far you will probably get a melt down. Yes, parents and grandparents have meltdown too. Remember we want everyone to have fun at Disney!
Some of these helpful hints can be used for the grandparents too. Sadly, when we are not as young as we used to be it is important to know our limits and not push them. It is no fun for grandparent meltdowns either.
Sleep, rest and hydrate-probably your top 3 factors. Make sure to get enough of all of them.
Have fun and enjoy your day at Disney!!