This ground requires a finding that an essential element to a proper will execution is missing, e.g. lack of the required number of witnesses.
Lack of Testamentary Capacity.
This is essentially a claim that the testator (will signer) was not legally competent to make a will at the time of the will execution.
Duress or Undue Influence.
This requires a showing that the testator was not acting on his or her own free will, but rather acting at the direction of someone else.
This is a claim that someone defrauded the testator through lies or deception into making a particular will.
This is a claim the will in question was not in fact signed by the testator, and the signature is a forgery.
This is a claim that an act of the testator or other occurrence revoked the will in question. For example , the subsequent execution of a new will will may be considered a revocation of the prior will. Also, the testator's marriage after the date the will was signed may revoke the prior will by operation of law. In some jurisdictions, the inability to produce an original will creates a presumption that the testator destroyed the original will as an act of revocation