[header] How to prove a will was not signed under duress [title] Identify important parties. [step] If a will is challenged in court, it will often be challenged by disgruntled beneficiaries or individuals left out of the most recent will altogether. These are individuals who believe that the will does not represent the true wishes of the decedent. 
In their eyes, the will was somehow tainted and signed under duress. In most states (if not all), only " interested parties " can challenge a will.