Managing Partner Steven Farley Bliss and his team , focused on SoCal estates, shows professional planning documents ready for clients handling complex tax details discussing: Burden Of Proof Who Must Prove A Will Is Valid During Probate?

Burden Of Proof Who Must Prove A Will Is Valid During Probate?

Betty‘s family was devastated when his estranged brother, whom he hadn’t spoken to in over a decade, suddenly appeared contesting his will. The will, drafted years ago, was perfectly valid on its face, but the brother claimed Betty was not of sound mind when he signed it. The ensuing legal battle dragged on for two years, costing the estate $128,739 in attorney’s fees and significantly delaying the distribution of assets to Betty‘s intended beneficiaries.

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The burden of proof in a will contest falls squarely on the challenger. California law presumes a properly executed will to be valid. This means the person contesting the will – the contestant – must present compelling evidence to overcome that presumption. An experienced wills attorney can help you understand the specific requirements for proving a will’s validity, and the potential pitfalls of a contest. This is a complex area of law, and a successful challenge requires a thorough understanding of probate procedures and evidentiary standards.

The contestant must demonstrate, by a preponderance of the evidence, that the will is invalid. A comprehensive estate planning strategy can minimize the risk of a will contest by ensuring proper execution, addressing potential conflicts of interest, and documenting the testator’s capacity. Without a solid estate plan, even a seemingly straightforward will can be vulnerable to attack.

What evidence is needed to prove a will is valid?

Managing Partner Steven Farley Bliss and his team , focused on SoCal estates, shows professional planning documents ready for clients handling complex tax details discussing: Burden Of Proof Who Must Prove A Will Is Valid During Probate?

Proving a will’s validity typically involves presenting several types of evidence. First, the original will itself is crucial. If the original is lost, a copy may be admitted under specific circumstances, but this adds another layer of complexity. Testimony from the witnesses who observed the signing of the will is also essential. These witnesses must attest to the testator’s signature, their understanding of the document as a will, and the testator’s mental capacity at the time of signing.

Additional evidence can include medical records demonstrating the testator’s cognitive state, correspondence or statements made by the testator expressing their intentions, and testimony from individuals who interacted with the testator around the time the will was executed. A CPA-attorney can be particularly helpful in analyzing financial records to corroborate the testator’s understanding of their assets and their disposition in the will.

What does “testator’s capacity” mean in a will contest?

“Testator’s capacity” refers to the testator’s mental ability to understand the nature of the act of making a will, the extent of their property, and the identity of their natural heirs. It does NOT require perfect health or the absence of any mental impairment. However, the testator must be able to form a rational plan for distributing their assets. Conditions like dementia or Alzheimer’s disease do not automatically invalidate a will, but they can raise concerns about capacity.

The contestant must prove the testator lacked this capacity at the time the will was signed. This often involves presenting medical evidence and testimony from individuals who observed the testator’s behavior. A CPA-attorney can analyze financial transactions and estate planning decisions made around the time of the will’s execution to assess the testator’s understanding of their financial affairs.

Can undue influence invalidate a will?

Undue influence occurs when someone exerts such control over the testator that the will reflects their wishes rather than the testator’s own. This is distinct from simply persuading the testator to make certain provisions. To prove undue influence, the contestant must demonstrate a confidential relationship between the testator and the influencer, the influencer’s active participation in the will’s preparation, and the resulting will’s provisions being unnatural or unfair.

Establishing undue influence is often difficult, requiring evidence of coercion or manipulation. A well-drafted will, prepared with independent counsel, can help mitigate the risk of an undue influence claim. A CPA-attorney can analyze the will’s provisions in the context of the testator’s overall financial situation and family dynamics to identify potential red flags.

What is the role of the court in a will contest?

The court acts as a neutral arbiter in a will contest, evaluating the evidence presented by both sides. The contestant bears the burden of proving the will’s invalidity. The court will consider witness testimony, medical records, and other relevant evidence to determine whether the will is valid. If the contestant fails to meet their burden of proof, the court will uphold the will.

The probate process in San Diego can be complex, and a will contest adds another layer of difficulty. A skilled attorney can guide you through the process, gather evidence, and present a compelling case on your behalf. The court’s decision is final, and it’s crucial to have experienced legal representation to protect your interests.

What happens if the will is found invalid?

If the court determines a will is invalid, the estate will be distributed according to California’s intestate succession laws. These laws dictate how assets are divided among the testator’s heirs based on their relationship to the deceased. For example, if the testator had a spouse and children, the spouse and children would share the estate according to a statutory formula.

A CPA-attorney can help you understand the tax implications of intestate succession, as the distribution of assets may differ from what was intended in the invalid will. It’s important to note that intestate succession may not align with the testator’s wishes, highlighting the importance of having a valid will in place. In San Diego, the probate court will oversee the distribution of assets according to these laws.

How can I prevent a will contest?

Preventing a will contest starts with careful estate planning. This includes working with an attorney-led will drafting counsel to ensure the will is properly executed and addresses potential conflicts of interest. Documenting the testator’s capacity and intentions is also crucial. Consider including a “no-contest clause,” which discourages beneficiaries from challenging the will by potentially forfeiting their inheritance.

Regularly reviewing and updating the will to reflect changes in circumstances is also important. A CPA-attorney can help you analyze the tax implications of any changes and ensure the will aligns with your overall estate planning goals. A structured testamentary drafting strategy, combined with proactive documentation, can significantly reduce the risk of a costly and time-consuming will contest.

California Wills & Execution Statutory Authority (2025–2026)
Execution & Validity
Probate Code § 6110

Witness Requirements: Mandates two simultaneous witnesses; includes the ‘Harmless Error’ rule to save defectively executed wills.

Probate Code § 6111

Holographic Wills: Standards for valid handwritten wills where material provisions and signature are in the testator’s hand.

Probate Code § 6112

Interested Witnesses: Presumption of fraud/duress when a beneficiary acts as a witness.

Probate Code § 6113

Choice of Law: Recognition of wills validly executed outside California or under prior domicile laws.

Lodging & Lost Wills
Probate Code § 8200

Lodging Requirements: Mandatory delivery of original wills to the Superior Court within 30 days of death.

Probate Code § 8223

Lost or Destroyed Wills: Procedure to prove the contents of a missing original through credible evidence.

Probate Code § 6124

Presumption of Revocation: Legal presumption that a missing will last in the testator’s possession was intentionally destroyed.

Probate Code § 8220

Evidence of Execution: Requirements for witness testimony or affidavits to prove a will during probate.

Revocation & Updates
Probate Code § 6122

Divorce Revocation: Automatic nullification of will provisions for a former spouse upon dissolution.

Probate Code § 21610

Omitted Spouses: Protections for spouses married after the will’s execution.

Probate Code § 6120

Revocation by Act: Legal methods for revoking a will through burning, tearing, or subsequent documents.

Probate Code § 6200

Statutory Wills: Standardized California form for simple estate distribution.

Attorney Advertising, Legal Disclosure & Authorship
ATTORNEY ADVERTISING. This content is provided for general informational and educational purposes only and does not constitute legal, financial, or tax advice. Under the California Rules of Professional Conduct and State Bar advertising regulations, this material may be considered attorney advertising. Reading this content does not create an attorney-client relationship or any professional advisory relationship. Laws vary by jurisdiction and are subject to change, including recent 2026 developments under California’s AB 2016 and evolving federal estate and reporting requirements. You should consult a qualified attorney or advisor regarding your specific circumstances before taking action.
Responsible Attorney: Steven F. Bliss, California Attorney (Bar No. 147856).
Local Office:
San Diego Probate Law
3914 Murphy Canyon Rd
San Diego, CA 92123
(858) 278-2800
San Diego Probate Law is a practice location and trade name used by Steven F. Bliss, Esq., a California-licensed attorney.
About the Author & Legal Review Process
This article was researched and drafted by the Legal Editorial Team of the Law Firm of Steven F. Bliss, Esq., a collective of attorneys, legal writers, and paralegals dedicated to translating complex legal concepts into clear, accurate guidance.
Legal Review: This content was reviewed and approved by Steven F. Bliss, a California-licensed attorney (Bar No. 147856). Mr. Bliss concentrates his practice in estate planning and estate administration, advising clients on proactive planning strategies and representing fiduciaries in probate and trust administration proceedings when formal court involvement becomes necessary.
With more than 35 years of experience in California estate planning and estate administration, Mr. Bliss focuses on structuring enforceable estate plans, guiding fiduciaries through court-supervised proceedings, resolving creditor and notice issues, and coordinating asset management to support compliant, timely distributions and reduce fiduciary risk.

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