“He was completely fine when I saw him.”
“That’s not true. He didn’t even recognize me two days later.”
Both statements may be accurate.
One of the most difficult realities families face as parents age is that cognitive decline is rarely a straight line. Capacity is not always an on-or-off switch. A person may seem sharp, engaged, and independent one day, then confused, forgetful, or vulnerable the next.
When important estate planning decisions are made during this period, disagreements often arise. Children, caregivers, physicians, attorneys, and even judges may have very different views of what was happening at the time a document was signed.
So how is capacity actually evaluated in California estate planning cases?
The Family Meeting That Changed Everything
Imagine this scenario.
After their father’s passing, three siblings gather to review his trust. For years, everyone expected the estate to be divided equally among the children.
Instead, they discover an amendment signed eighteen months before his death that leaves the majority of the estate to one child.
Immediately, questions begin.
“There’s no way Dad would have done this.”
“He wasn’t thinking clearly.”
“He had dementia.”
The child who benefited responds differently.
“Dad knew exactly what he wanted.”
“He talked about this for years.”
“His attorney met with him privately.”
Suddenly, the family’s grief becomes a dispute over capacity.
And often, both sides have evidence that appears convincing.
The Challenge of Good Days and Bad Days
Many people assume that once someone receives a diagnosis such as dementia, Alzheimer’s disease, or cognitive impairment, they automatically lose the ability to make legal decisions.
That is not how the law works.
In reality, many individuals experience periods of clarity mixed with periods of confusion. Some can hold meaningful conversations, understand their finances, recognize family members, and express consistent wishes, even while struggling with memory issues at other times.
This creates a difficult question:
What was the person’s mental state on the day they signed the document?
Not six months before.
Not six months after.
The day the decision was made.
That question often becomes the focus of litigation.
Capacity Is Decision-Specific
One of the most misunderstood aspects of California law is that capacity is not evaluated the same way for every decision.
The level of understanding required to sign a trust amendment may be different from the level required to manage investments, enter into contracts, or make complex financial decisions.
Courts generally look at whether the person understood:
- The nature of the document they were signing
- The general nature and extent of their property
- The people who would naturally receive their assets
- The effect of the decision they were making
A person does not need a perfect memory.
They do not need to remember every bank account balance.
They do not need to be free from every cognitive impairment.
The question is whether they possessed sufficient understanding at the time the document was executed.
Why Family Members Often See Different Things
One reason capacity disputes become so emotional is that family members are often witnessing different versions of the same person.
A daughter who visits every Thursday may see confusion, repeated questions, and memory lapses.
A son who joins his father for lunch every Monday may experience meaningful conversations and clear decision-making.
A physician may evaluate the parent during a routine appointment.
An attorney may spend an hour discussing estate planning goals.
A caregiver may observe daily challenges that no one else sees.
Each person forms a different conclusion based on a limited window into the parent’s life.
The result is often a sincere disagreement rather than a simple dispute between right and wrong.
What Evidence Matters?
When capacity is questioned, courts and attorneys often look at multiple sources of information, including:
- Medical records
- Physician evaluations
- Attorney notes
- Witness testimony
- Caregiver observations
- Emails, letters, and text messages
- Prior estate planning documents
- Video or audio recordings when available
No single piece of evidence automatically decides the case.
A diagnosis alone may not be enough.
Likewise, a brief conversation where someone appeared alert may not tell the entire story.
The goal is to reconstruct what the person’s mental state was when the document was signed.
The Attorney’s Role
One reason experienced estate planning attorneys spend significant time meeting privately with clients is to evaluate capacity firsthand.
When concerns exist, attorneys may ask additional questions, take detailed notes, involve physicians, obtain written evaluations, or implement other safeguards.
These steps are not designed to create obstacles.
They are designed to protect the client and help ensure their wishes are honored later.
A carefully documented planning process can often prevent future disputes before they begin.
The Real Cost of Waiting
Families sometimes delay important planning conversations because they are uncomfortable discussing aging, illness, or cognitive decline.
Unfortunately, waiting often creates greater uncertainty.
As capacity becomes more difficult to evaluate, the risk of future conflict increases. Documents that could have been completed with confidence years earlier may become vulnerable to challenge.
The best time to create or update an estate plan is while there is little question about a person’s ability to make decisions.
Not during a crisis.
Not after a diagnosis progresses.
Not when family members are already disagreeing.
Final Thoughts
The reality is that capacity is rarely as simple as “competent” or “incompetent.”
Many people experience good days and bad days. Families may honestly disagree about what they observe. Physicians, attorneys, and loved ones may each see a different piece of the puzzle.
When questions arise, California law focuses on a critical moment: whether the person understood the decision they were making when they made it.
For families, that distinction can mean the difference between carrying out a loved one’s wishes and spending years fighting over what those wishes truly were.
The best protection is thoughtful planning, clear documentation, and having important conversations before uncertainty begins to cloud the picture.
