Parol evidence is admissible to show the existence of grounds that would cause the contract to be void. Such grounds include illegality, fraud, duress, mistake, and lack of consideration. And parol evidence is allowed to show evidence of lack of contractual capacity. Evidence of infancy, incompetency, and so on would not change the terms of the contract at all but would show it was voidable or void.
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Void or Voidable Contracts