Thank you @Rick&Jeannie and @insidecabin. Your replies are helpful and mostly what I expected but was hoping otherwise. I think that even they are not sure how much or little movement will cause problems so I won't encourage more than just presenting the itinerary to them. I know that when we sail along the east coast, even when we don't notice the movement, we hear others complaining about how rough it is so I understand that everyone's sensitivity can vary greatly.
Thanks again!