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Common reasons to contest a trust or will in California

On Behalf of | Nov 7, 2025 | Trust Litigation

Sometimes a trust or will does not reflect someone’s true intentions. You may need to act if legal red flags suggest the document is invalid.

Who can contest and when

You can contest a trust or will only if you are an interested party such as a beneficiary, heir or creditor with a claim. Once the court admits a will to probate, you have 120 days to file an objection. If you miss that deadline, the court may dismiss your challenge before a judge even reviews it.

Fraud or undue influence

Courts may set aside a document if someone manipulated, coerced or isolated the signer to change gifts. Forgery also supports a challenge when the signature or pages are not genuine.

Capacity

The law presumes adults are competent but evidence can prove otherwise. Under California Probate Code §6100.5, a person must understand the act of creating the will or trust, know what property they own and recognize their relationship to the people named in the document. 

If someone had dementia, delusions or another condition that affected judgment at the time of signing, the court can rule the will or trust invalid for lack of capacity.

Violating execution rules

California law requires a written document signed by the person making it and two witnesses who also sign. Witnesses should not be beneficiaries. If these rules weren’t followed, the court can declare the document invalid.

Multiple documents

A newer valid will or trust usually replaces an older one. Disputes often arise when multiple versions conflict or when signatures and dates don’t match.

Situations that should prompt action

Be attentive of any circumstances that may arise. You should look closer if any of these occur:

  • Sudden, sweeping changes: Late-life revisions that cut out long-standing heirs.
  • Isolation or control: A caregiver or acquaintance restricts access to family.
  • Execution problems: Missing witnesses or beneficiary-witness signatures.
  • Conflicting papers: Two versions with different terms or dates.

These signs do not prove a case but they can justify filing and preserving your rights.

Options you can exercise next

Contesting a trust or will in California takes quick action and solid evidence. The facts, timing and documentation all affect whether your case can succeed. A California estate litigation attorney can review your situation, explain your rights and guide you toward the best strategy for your case.