Few things are harder than opening a parent’s will and finding something that makes no sense. A caregiver who appeared in the last year of your mother’s life now inherits the house, or your sibling who handled Dad’s finances is suddenly the sole beneficiary. When the estate includes a Santa Clara County home, the difference between one version of a will and another can easily run into seven figures.
California does give family members and beneficiaries a way to challenge a will they believe is invalid. But the law is narrow. You cannot contest a will simply because it feels unfair, and the deadlines are short and unforgiving. This guide explains who can bring a California will contest, the legal grounds courts recognize, how the process works, and the deadlines that control everything.
Important: This article provides general information about California law. It is not legal advice, and reading it does not create an attorney-client relationship. Will contests turn on specific facts and strict deadlines. If you believe a will is invalid, speak with a licensed California attorney about your situation as soon as possible.
Who Can Contest a Will in California?
Only an “interested person” can bring a will contest, a term defined in Probate Code Section 48. In practical terms, that usually means someone who would receive more if the will were thrown out. Common examples include:
- Children or other heirs who would inherit under California’s intestate succession rules if no valid will existed
- Beneficiaries named in an earlier will who were cut out or reduced by a later one
- Beneficiaries whose share was changed by a codicil they believe is invalid
A neighbor who was promised a painting but never appeared in any will generally lacks standing. So does an heir who would receive the same amount no matter which document controls.
Grounds to Contest a Will in California
California’s Probate Code lists the recognized grounds directly. Under Section 8252, the person defending the will must prove it was properly executed, while the person challenging it carries the burden of proving lack of testamentary intent or capacity, undue influence, fraud, duress, mistake, or revocation. Here is what those grounds look like in real disputes.
Lack of Testamentary Capacity
The bar for making a valid will is lower than most people expect. Under Probate Code Section 6100.5, a person lacks capacity if, at the moment of signing, they could not understand what making a will means, could not recall the nature of their property, or could not remember and understand their relationships with close family and others affected by the will. A will can also fail if a mental health disorder caused delusions or hallucinations that led the person to leave property in a way they otherwise would not have.
A dementia diagnosis alone does not automatically invalidate a will. Capacity is measured at the time of signing, and people with cognitive decline can have lucid periods. Strong capacity cases usually rely on medical records, physician testimony, and witnesses who observed the person’s condition around the date the will was signed.
Undue Influence
Undue influence is the most common ground in California will disputes, and often the most emotionally charged. California borrows its definition from the elder abuse statutes: undue influence is excessive persuasion that overcomes a person’s free will and produces an unfair result. Courts look at factors such as the vulnerability of the person making the will, the influencer’s position of authority or trust, the tactics used (isolation, controlling access to family, controlling finances), and whether the outcome was inequitable.
Two presumptions can shift the burden onto the person who benefited:
- The common-law presumption. If the challenger shows the beneficiary had a confidential relationship with the decedent, actively participated in getting the will prepared or signed, and received an undue benefit, the beneficiary must then prove the absence of undue influence.
- The statutory presumption. Probate Code Section 21380 presumes a gift is the product of fraud or undue influence when it goes to the person who drafted the will, a fiduciary who transcribed it, or a care custodian of a dependent adult if the will was signed during the caregiving period or within 90 days before or after. The beneficiary can overcome this only with clear and convincing evidence, and a gift to the drafter is conclusively presumed invalid.
These presumptions matter enormously in the Bay Area, where aging parents often rely on paid caregivers or a single adult child who lives nearby.
Fraud
Fraud comes in two main forms. Fraud in the execution happens when someone signs a will believing it is a different document. Fraud in the inducement happens when someone lies to the testator to change their plans, such as falsely claiming a child has been stealing from them. Forgery, where the decedent never signed the document at all, is also a basis for challenge.
Improper Execution
A formal California will must be in writing, signed by the testator, and witnessed by two people who were present at the same time and understood the document was the testator’s will (Probate Code Section 6110). A handwritten (holographic) will can be valid without witnesses, but its signature and material provisions must be in the testator’s own handwriting. If a witness also receives a gift under the will, the law presumes the gift was obtained through duress, menace, fraud, or undue influence unless that witness proves otherwise.
That said, courts can still admit a technically flawed will if there is clear and convincing evidence the testator intended it to be their will, so execution defects are not automatic wins.
Duress, Mistake, and Revocation
Duress involves threats or coercion. Mistake covers narrow situations where the document does not reflect what the testator intended to sign. Revocation arises when a later will or a physical act, such as intentionally destroying the original, canceled the will being offered for probate.
What Is Not a Valid Reason to Contest
California protects a person’s right to leave property however they choose. Unequal gifts, disinheriting a child, or leaving everything to a new spouse are not grounds for a contest on their own. We explain the rules around this in our article on disinheriting family in California.
Some situations that feel like will contests are actually separate claims. A spouse or child who was accidentally left out because the will predates the marriage or the child’s birth may have an omitted spouse or omitted child claim. These follow different rules, and an attorney can tell you which path fits your facts.
California Will Contest Deadlines
Timing controls whether you get to argue your case at all. There are two windows.
Before the Will Is Admitted to Probate
When someone files a petition to probate a will, notice of the hearing is published in a local newspaper and mailed to heirs and beneficiaries. An interested person can file a written objection before the court admits the will. Under Section 8250, a summons is then issued, and the other parties have 30 days after service to respond. Objecting at this stage is generally the strongest position because it stops the will from being admitted while the dispute is resolved.
The 120-Day Window After Admission
If the will has already been admitted, Probate Code Section 8270 gives interested persons 120 days from the date of admission to petition the court to revoke probate. The clock runs from admission, not from the date of death and not from when you first saw the will.
There are important limits. Anyone who was already a party to a will contest, or who had actual notice of one in time to join it, generally cannot file a separate petition. The main exception protects people who were minors or legally incompetent without a guardian or conservator when the will was admitted. They may petition any time before the court orders final distribution.
If the Estate Plan Uses a Trust
Many Bay Area estates pass through a living trust with a pour-over will. Trust contests follow a separate deadline under Probate Code Section 16061.8, generally 120 days after the trustee serves the required notice, or 60 days after a copy of the trust is delivered on request, whichever is later. If you have received a trustee’s notice, treat that date as urgent.
In our experience, missed deadlines and missed notice requirements are among the most common mistakes people make when they try to handle probate matters on their own. A strong contest filed on day 121 is usually no contest at all.
How a Will Contest Works, Step by Step
Every case is different, but most California will contests follow a similar path.
- Get the documents. The person holding an original will must deliver it to the court clerk within 30 days of learning of the death. Once a probate case is open, the petition, the will, and later filings are part of the court record. Obtain copies of any earlier wills as well.
- Evaluate standing, grounds, and risk. An attorney will assess whether you are an interested person, which grounds the facts support, and what you stand to gain. If the will contains a no-contest clause, California enforces it only in limited situations, including a direct contest brought without probable cause. Our guide to no-contest clauses in California trusts and wills explains how this works.
- File the objection or petition to revoke. The filing must state the written grounds of opposition, and the summons must be served on the personal representative and the heirs and beneficiaries.
- Discovery. Both sides gather evidence: medical records, the drafting attorney’s file and testimony, witness depositions, bank records, and communications that show who arranged the will and why.
- Mediation and settlement. Most will contests resolve before trial. Litigation is expensive, and a negotiated outcome often preserves more of the estate for everyone.
- Hearing or trial. California will contests are decided by a judge, not a jury. In Santa Clara County, the local probate rules provide that contested matters requiring three hours or less may be heard by the Probate Division, while longer hearings and trials go to the Civil Division’s master trial calendar, with the Probate Division handling issues up to trial. Probate matters are heard at the Downtown Superior Courthouse at 191 North First Street in San Jose.
If the court invalidates the will, the estate passes under the most recent valid earlier will or, if there is none, under intestate succession.
Probate’s Structure Can Help You
Nearly everything written about estate planning tells people to avoid probate. As Martin H. Bayer, an attorney with our firm, points out, the rigid, court-supervised nature of probate is sometimes an advantage. Every step is on the record. Required notices must go to heirs and beneficiaries. Court staff attorneys review filings before a judge rules. Compare that to a family trust where one sibling serves as trustee and the other two receive little information. In that setting, problems can go unnoticed far longer.
For a potential contestant, that structure means you are more likely to receive notice, there is a court file to review, and a judge oversees the outcome. It also means the process runs on fixed timelines. Some counties, including San Benito and Santa Cruz, enforce local probate deadlines strictly, while Santa Clara County has historically been more flexible on certain administrative filings. Do not mistake that flexibility for leniency on contest deadlines. The 120-day window in Section 8270 is set by statute, not local practice.
It is also worth being realistic about cost. Litigation has a price, and not every concern justifies a lawsuit. A candid attorney will help you weigh what is at stake, such as your share of assets subject to probate or an interest in the family home, against the time, expense, and family strain a contest involves.
Talk to a San Jose Will Contest Attorney Before the Deadline Passes
If you suspect a loved one’s will was the product of undue influence, fraud, or diminished capacity, the most important step is getting timely advice. Evidence fades, witnesses become harder to reach, and the 120-day clock does not pause while families sort out their feelings.
The Dayton Law Firm, P.C. serves families in San Jose, Santa Clara County, and throughout the Bay Area, including San Mateo, Alameda, and San Benito counties. Learn more about our probate practice or contact us to schedule a consultation.
This article is for general informational purposes only and does not constitute legal advice. Every situation is different, and the law may change. Please consult a qualified California attorney about your specific circumstances before taking action.