Will contests: focus on a defective execution, a testator's lack of capacity , or a revocation. Lack of capacity: testator must be 18 or older, must be of sound mind and understands the nature of the act, understands the nature and extent of his property, beneficiaries are the natural objects of his bounty, and testator understands the nature of the disposition he is making.
A will contest based on the will being obtained through the exercise of undue influence requires 1) influence exerted on testator (physical or mental) 2) effect of influence overpowers the testator's mind and free will and 3) product of influence was a will not being executed but for the influence.
Fraud: could be fraud in the factum, aka fraud in the execution, or fraud in the inducement. Fraud in the factum involves a misrepresentation as to the nature of the contents of the will. Fraud in the inducement involves a misrepresentation as to the facts that would influence the testator's motivation to make a will in the first place.
Testamentary intent can be missing when there is undue influence, fraud in the execution or inducement of the making of the will, mistake in the execution or inducement of the making of the will, or a conditional will. A conditional will takes effect only after the condition precedent is satisfied.
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A no-contest clause (aka an "in terrorem" clause) attempts to disqualify anyone contesting the will from taking under it. This clause will be enforceable if the will contest is unsuccessful and no probable cause existed.