Have the survey done. If they removed the fence from your relative's property and it was done relatively recently, you may have grounds (or your relative) for having them replace the fence. Laches will be in play here and depending on how long ago your relative became aware of the fence removal, you may end up replacing it yourself. If the survey shows the land to be your relative's, then you (she) should hire a real estate attorney to advise on how to best proceed with the replacement of the fence and any negative effects on title. As I commented below, Florida law requires that a party seeking to AP must file - within one year of taking possession - a "return" to the tax collector claiming an interest in the property. The tax collector then notifies the person on record as having paid the taxes to that point (usually the rightful owner) and then the seven year AP clock begins to run. If the neighbor has NOT filed the return, they cannot claim the property by AP.
Carol Johnson Law Firm, P.A. : (727) 647-6645 : firstname.lastname@example.org : Wills, Trusts, Real Property, Probate, Special Needs: Information provided here is anecdotal and should not be relied upon or considered legal advice. Every matter is different and answers given here are general in nature and may not reflect current Florida law at the time you are reading this posting. Please contact me if you feel you need additional assistance with your matter.
Possibly. Be sure you have evidence. Depending on the time line, they may have a claim for adverse possession. I would contact a local real estate attorney as soon as possible. Time is not on your side and you may need to "Quiet Title" or get a declaratory judgment as to ownership.
I agree that you should get a survey. However, if the survey shows that the land actually belongs to you, do not tear down the fence on your own. Have a lawyer help you inform the neighbor that the fence is in the wrong place. You do not want a confrontation with your neighbor if you can avoid it.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.