A “contest” is usually mounted by the filing of the necessary documents with the probate court by an heir, prospective heir or another beneficiary. Each state has different time limits that control the window for filing. To successfully challenge a will, there must be sufficient evidence that the will was not created properly. Sour grapes or being upset that a person didn’t receive what they felt they had coming are not sufficient grounds for contesting a will. Typically, only certain factors are mandated by law to be contestable. These might encompass the incapacity or incompetence of the decedent at the time the will was prepared, fraudulent intent on the part of some parties to the will or undue influence or duress perpetrated on the decedent.