Can I Contest a Trust or Will in California If I Was Disinherited?

Your parent dies.

A will or trust suddenly appears.

One sibling gets everything.

You’re left confused, shocked, angry — or completely cut out.

So late at night, you start Googling:

“Can I contest a trust in California?”
“Do I have rights if I was disinherited?”
“Can my sibling legally inherit everything?”
“Can I fight a will without a lawyer?”
“What actually makes a probate case valid?”

Most people begin searching because something feels wrong.

But probate court does not usually decide cases based on feelings alone.

Before the court ever looks at whether something was unfair, it often looks at three threshold questions first:

• Are you acting within the legal deadline?
• Are you legally the right person to bring the case?
• Do you actually have legal grounds recognized by probate court?

That’s what this article is about.

Watch: The 3 Requirements Probate Court Looks At First

If you want to see me break down the critical threshold documents you need to look for, watch the full video breakdown below:

A Quick Note from Angelique: My name is Angelique Hamane. I’m an educator, not a lawyer. I am someone who had to represent myself in probate court ("Pro Per") when I couldn’t afford an attorney. This article is for educational purposes only and is not legal advice.

When I first started going through this process, I didn’t even know what probate court was. I just assumed there was one court. But over time, I realized probate court is often far more procedural than emotional. The court first wants to know whether your case legally belongs there. That’s where these three requirements come in.

Requirement 1: The Right Time (The Statute of Limitations)

When I say the right time, I’m talking about the legal statute of limitations. Are you still within the deadline to do anything? In probate court, you might be entirely in the right—but if you’re too late, the judge cannot help you.

Most people assume they can challenge a will or trust whenever they happen to discover something suspicious. But California probate disputes have strict, unforgiving deadlines.

The California 120-Day Rule Explained

• For Wills (Probate Code § 8270): If a will is admitted into probate and you believe something is wrong, the law allows you to object before the will is admitted, or to challenge its validity within 120 days after it is admitted.
• For Trusts (Probate Code § 16061.7): Trust disputes follow a similar timeline. The 120-day clock usually starts the exact day a trustee sends a formal, mandatory notice often called a Notification by Trustee to beneficiaries and heirs.

Are there exceptions? Yes—especially if proper legal notice was never actually given to you. But the key takeaway is that the courtroom door does not stay open forever. If the deadline has already passed, you might be out of luck, even if you are right.

Requirement 2: The Right Person (Legal Standing)

Timing is only the first gate. The second requirement is that you must be the right person to bring the case before a judge. In the legal world, this is called standing.

Standing means that you stand to legally gain or lose something depending on the outcome of the lawsuit.

Who is an "Interested Person" under Probate Code § 48?

California law explicitly restricts who can bring a dispute. According to Probate Code Section 48, an "interested person" may include:

• An heir at law: A spouse, child, or sibling who would naturally inherit if there was no will.
• A named beneficiary: Someone explicitly named in the current will or trust.
• An omitted beneficiary: Someone who appeared in an earlier version of the estate plan but was completely removed or reduced in the final version.
• A named fiduciary: A trustee, successor trustee, or executor who has explicit legal duties tied to the estate.

The Pro Per Litmus Test for Standing

Whether someone qualifies as an “interested person” depends entirely on the specific issue the court is being asked to decide. Here is the simplest way to think about it:

If the court fixes the problem by invalidating the disputed will or trust—meaning the estate is treated as intestate (no valid estate plan exists)—does money or property move into your pocket?

If the answer is no, the court may decide you are not the right person to bring the case. Without standing, your petition will be dismissed before the judge ever looks at the evidence.

Requirement 3: The Right Place (Valid Legal Grounds)

Let’s say you are within the legal deadline, and you have standing. There is one final hurdle: Do you belong in probate court?

There are different types of courts—family court, civil court, criminal court, and probate court. While probate court handles litigation and legal disputes about whether a will or trust is valid, it is not designed to resolve hurt feelings or general family drama.

To stay in probate court, your case must be based on specific, legally recognized grounds.

Legally Recognized Probate Claims in California:

• Lack of Capacity: Proving the person did not mentally understand what they were signing at the exact time of execution.
• Undue Influence: Proving someone heavily pressured, isolated, or manipulated a vulnerable person into changing their estate plan.
• Fraud or Forgery: Proving the document itself is fake, signatures were forged, or the person was tricked into signing it.
• Breach of Fiduciary Duty: Proving an executor or trustee is actively mismanaging estate assets, stealing, or illegally hiding information from you.

If your dispute does not fit cleanly into one of these specific legal categories, the judge will decide that probate court is not the right place for your case.

Summary: The Self-Litigant's Checklist

Representing yourself is a highly procedural journey. Instead of dramatic courtroom arguments, your success will depend entirely on avoiding procedural defects, tracking down probate notes, meeting notice requirements, and clearing these three hurdle gates.

Before you spend time, energy, and money, stop and ask yourself these three core questions:

1. Am I acting at the right time (within the statute of limitations)?
2. Am I the right person to bring this case (do I have legal standing)?
3. Do I have the right legal grounds recognized by California probate court?

If all three requirements are met, then you may have a probate case worth exploring.

Next Steps: Take the Free Case Evaluation Quiz

Knowing you might have a case is only the first step. If you want help evaluating your current situation without paying an expensive retainer, take my free "Do You Have a Probate Case?" Quiz linked below.

It walks you through these exact three requirements and includes a free downloadable Probate Evidence Checklist to help you begin gathering the specific documents you will need to prove your case in court.

👉 [Take the Free Probate Case Evaluation Quiz Now]

Disclaimer: I am an educator and a self-represented litigant, not an attorney. This article is for educational purposes only and does not constitute legal advice.