river cruises

Considering the Rhine or Danube river cruise for my family but my mother (70) gets seasick easily. I have heard the river cruises aren't rough, little to no motion felt. Can anyone confirm what they are like as far as motion, rocking etc? Also if you prefer the Rhine cruise or the Danube- Thanks!

In this week's episode of the Dreams Unlimited Travel Podcast, John and Kevin have returned from their Adventures by Disney Christmas River Cruise and want to discuss the "Disney Difference" when traveling with AMA Waterways and Adventures by Disney!