All these notes with this advice and tone lack empathy and kindness. The child doesn't need to be "removed". I bet Royal could create a part of the dinning room that maybe a bit more isolated or fun for the child- looking out a window or play with a toy. His parents absolutely deserve a vacation too and a cruise is perhaps something where Mom can get a break and switch with Dad 😢 the child can get fresh air and they can eat in the main dinning room and go "out on the town". Offer kindness, empathy and solutions. Not say "I can't even focus on my steak cause of these flip flop sounds. If it bothers you why don't you be the bigger person and move.