Surveyors make mistakes all the time. It seems like that there is no fence’s on the land you are referring to. So I don’t think the 25 year rule in Texas is valid. Adverse Possession is a very poor way to try to acquire land in Texas. There was no GPS for surveyors to use back in 1978 in Texas. One surveyor can state the property lines and boundaries and then another can state something totally different. This happens all the time in Texas at the present time. In Texas, currently land cannot be “land locked”. A court order can and will grant an easement. The land you are referring to that was taken from you supposedly didn’t have an easement you stated. By paying property taxes in Texas on land you don’t own doesn’t make it yours, so many times I’ve seen people state that if you pay the taxes for 5 year’s it becomes your’s, If 4 family members own a tract of land and only one pays the taxes that doesn’t make it theirs.