Notarizing for a Parent with Dementia or Memory Loss

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By the notaries at Mar Vista Cheap Mobile Notary, commissioned by the California Secretary of State · Updated October 26, 2026 · Sources: California Notary Public Handbook (Secretary of State, 2026), Probate Code § 810, Probate Code § 811, Probate Code § 4120, Probate Code § 4609

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What the notary needs to see

California notary law doesn’t give notaries a medical test, and notaries can’t diagnose. What the notary does is talk with the signer, without family answering for them, to be satisfied of three things:

1. They can communicate with the notary directly (not through a relative or interpreter).
2. They understand what they’re signing, in their own words: for example, “this lets my daughter pay my bills,” or “this says who makes medical decisions if I can’t.”
3. They’re signing willingly, not because someone in the room is pressuring them.

The notary may ask simple, open questions: What is this document? Who are you naming? Why? If the answers show the person doesn’t understand, or someone else keeps answering, the notary must stop. That protects the signer, and it protects the document from being challenged later.

What the law says about capacity

• California law presumes adults have capacity, and a diagnosis alone isn’t enough to find otherwise; capacity depends on the specific decision (Probate Code § 810, Probate Code § 811).
• To sign a power of attorney for finances, a person needs the capacity to contract (Probate Code § 4120).
• Health care decisions are measured by whether the person can understand the nature and consequences of the decision and make and communicate it (Probate Code § 4609).
• Capacity can vary through the day. A person may be clear in the morning and confused in the evening.

How to plan the appointment

• Schedule for the time of day the person is usually clearest (often mid-morning); ask caregivers or nurses
• Avoid times right after medication that causes drowsiness
• Keep the room calm and the group small; the agent named in the document shouldn’t answer for the signer
• Have the documents complete and printed in advance, with an attorney’s explanation done beforehand
• Have acceptable ID ready. Many older adults have expired licenses; a DMV ID issued within five years works, or two credible witnesses
• If the person can’t write, they can sign by mark; the issue is understanding, not handwriting
• Be prepared to reschedule if it’s a bad day. A rushed notarization is a weak notarization

Plan early

The best time to sign a durable power of attorney, advance health care directive and trust is shortly after a diagnosis, while the person can clearly take part. Durable documents keep working after capacity declines; that’s their whole purpose.

If it’s already too late

If the person can no longer understand or communicate their wishes, no notary can help them sign. The usual routes are an existing durable power of attorney or trust (if one was signed earlier), or a court-appointed conservatorship, which requires an attorney and a court process. A notary can’t accept a signature from someone else on their behalf.

Common questions

Can someone with dementia sign a power of attorney?

Possibly. A diagnosis alone doesn’t prevent it. The person must have the capacity to contract when they sign, and the notary must be satisfied they understand and are signing willingly.

Do I need a doctor’s letter for the notary?

California law doesn’t require one for a notarization. Attorneys sometimes obtain a physician’s capacity assessment when a document might be challenged.

Can I sign for my parent if they can’t?

Only with legal authority, such as an existing power of attorney (signing as their agent) or a conservatorship. You can’t sign their name for them in front of a notary.

What if the notary refuses?

It means the notary wasn’t satisfied the person understood or was signing willingly at that time. Sometimes another appointment at a better time works; sometimes it’s a sign to involve an attorney.