Our neighbor's driveway is over our property line by a couple of feet. We have known this since 2003 when we built, and although always a sore subject, it has not bothered us. However in the last year or so, they have objected to us putting up our fence on our own line (because it became obvious to the rest of the neighbors what they did) and there have been other not-so-neighborly incidents that have caused us not to trust them. We do not mind if they use the driveway, however do not want in any way for them to be able to claim ownership of the property, nor do we want to sell it to them. Also, we would like to revoke our permission at any point. What steps do we need to take to assure this? We do have a survey when we built the house showing that the driveway is over this line.

