Was a person forced to sign an estate planning document that they did not wish to sign? Did your evil sister or brother threaten your mom to change her POA? If you feel that a signature on a will, POA, or any estate planning document was forced, you may be able to argue duress. However, West Palm Beach probate lawyers know that there are certain factors that must be established in order to prove duress. A Fourth DCA opinion, AMS Staff Leasing Inc. v. Taylor, defines duress and explains those factors.