Short answer. Yes. Article 839 lists the grounds for disallowing a will, and one of them is that the will was executed through force or under duress, or the influence of fear or threats. So a will your father was threatened or forced into making can be contested and disallowed on that ground.

What the law says

If it was executed through force or under duress, or the influence of fear, or threats

Civil Code, Article 839 — Grounds to Disallow a Will. Read the full provision →

A will can be disallowed on specific grounds

A will is not beyond challenge simply because it was signed and witnessed. Article 839 sets out the grounds on which a court, in probate, must disallow a will. They include failure to comply with the required formalities, the testator's insanity or mental incapacity at the time of execution, procurement by fraud, mistake as to the nature of the document, undue influence, and, importantly here, the use of force, duress, fear, or threats. If any of these is established, the will is not admitted, because it does not genuinely reflect the free and capable act of the testator.

Force, duress, fear, or threats

The specific ground for a will extracted by coercion is stated in the article: a will is disallowed if it was executed through force or under duress, or the influence of fear, or threats. The premise is that a will must express the testator's own free disposition of his estate. When someone compels the testator by force, or bends his will through duress, fear, or threats, the document records the coercer's wishes, not the testator's. The law refuses to give effect to such a will, treating it as a product of pressure rather than of the testator's true intent.

What must be shown

To have a will disallowed on this ground, the challenger must show that force, duress, fear, or threats actually operated on the testator and overcame his free will in making the will, or in making it in the particular way it was made. It is not enough that the testator was generally unhappy or under stress; there must be coercion that produced the will or its contents. Evidence of the threats or compulsion, of the testator's vulnerability, and of the link between the pressure and the terms of the will all help establish that the document was not the testator's free act.

How and when to raise it

The place to attack a will on this ground is the probate proceeding, where the court decides whether to allow the will. An heir or other interested party who believes the testator was forced or threatened into making the will should oppose its allowance and present proof of the coercion. Because a coerced will fails to reflect the testator's true intent, establishing this ground defeats the will. The practical step is to come forward during probate with concrete evidence that force, duress, fear, or threats produced the document, rather than assuming the signature alone makes it valid.

Cases citing this provision

These Supreme Court decisions cite the provision above. We list them so you can read them yourself; the summaries of what each decided are not ours to give.

Note. Statute text quoted on this page is reproduced from the official enactment and is linked to the full provision. The explanation around it is general legal information from Vivas & Nobles Law Office, not legal advice. Whether it applies to your situation depends on facts only a lawyer reviewing them can assess.