re: Property lines disputes

They could get a copy of their survey from the mortgage records at the court house or from the city/parish depending on how recently their piece was surveyed. If your surveyor is confident that his map is correct, then they will need to provide evidence otherwise from another surveyor or map of record. There should be some reference maps listed on the 1995 map that you have that you could go get from the courthouse also. The reference map(s) would also have older regerence maps listed. Unless there is some old recorded boundary agreement between owners or some possession issues, the monuments in the ground should govern if they jive with older surveys and nothing has deviated over the years. There is a priority of evidence that governs what takes precedent but only gets involved if there is an ambiguity or evidence that the common boundary is not where your surveyor reported it to be located.