Motion Sickness Question

We used to look at property in the area to build on in a few years but stopped when we planned to move out of state.  Since we are staying, I am keeping my eye open for 5-10 acres of property.  The only problem is a majority of the property that is for sale on our side of town is in an area that gets flooded.  We'd need engine driven pumps to keep the water clear!

The other side of town is the prettier side because it is all rolling hills, except my kids and I get car sick and the land is more expensive.  Can you imagine wanting to yak everytime you drove to the grocery store?  Yuck!

Motion sickness - it makes me wonder.  If I had been born in this hilly area, would I still get car sick?  What is it that makes some people get car sick and others are fine with it?  Are all people born in the mountains immune to motion sickness?