Thanks ladies!
The reason there wasn't a survey done when we bought is that we bought on a land contract, so the title doesn't officially change hands until we're done paying for the property which will be in 3.5 yrs or less.
We did go to the county zoning office and were told the issue that caused the boundary disputes in this area has now been corrected, so whe we get a survey it will be indisputable. My parents old house was affected by this same issue and is just down the road from ours. When Mom sold it and there was a survey done, the lot shifted about 30 feet north of where they had always believed it to be.
IF ours goes 30 feet in the same direction we will be moving even closer to those wacky people.

I'm sure that would go over big!
Marilyn, I know it's not nice, but I told hubby the same thing as you said... hopefully they'll end up in jail soon again so we will have some peace. Hubby and wife are both on probation, so it's possible. They're not allowed to own or possess firearms for one thing, and they already told us they plan to go deer hunting, so that's a violation. They're also not allowed to drink, and carry in cases of beer frequently, and both drive without a valid license. Now they've been driving an unlicensed snowmoblie ON the road which is also illegal. We have snowmoblie tracks on 2 sides of our lot from them. So I think it's just a matter of time.
My husband drives semi, so his truck is parked between their house and ours in our driveway. I'm half hoping they will decide to mess with that, as it would be a federal offense if they do any damage or tamper with it. They'd end up with the State and federal marshalls and homeland security involved then.
A survey will cost us about $2,000, so we need some time to save that up. I'm afraid if we don't put up a stout fence at the same time that they'll just be bugging us even after that's done.