Motion sickness is your responsibility!
If you or any individual is prone to motion sickness, it oftentimes helps for that person to begin taking their pills (Dramamine, Bonine, etc,) up to 24 hours in advance in order to get the medication into the system. If patches are used, follow the doctors instructions when taking.
Also as a precaution the evening before and the morning of the trip, refrain from an excessive amount of alcohol and greasy foods. Try and eat drier, more digestible foods.