Wow...he's certainly not a diplomat.
I imagine it's hard to travel when there are food sensitivites, especially a child with sensativities.
It doesn't matter what the age of the child (or adult for that matter) is; in YC I'd assume there's better communications than the MDR.
On the first post, you were going to decide if you're "a cruising family". About the movement of the ship....it's a ship, it moves. As I said earlier, YC is located in the worst part of the ship if the ocean is rough. Next time, if there is a next time....book the lowest cabin in the middle for a smoother sail.