A sample declaration letter for child custody in California is a written statement, signed under penalty of perjury, that lays out facts about your child and the other parent for the judge to read before ruling. It carries the same legal weight as sworn testimony in open court, which is why what you put in it, and how you format it, matters. The strongest declarations are specific, firsthand, and tied to your child’s best interest. The weakest ones editorialize, repeat what other people said, or ignore the formatting rules and get struck.
Here is how to write one that a California family court will actually consider.
What Belongs in the Declaration
Tie Every Fact to Your Child’s Best Interest
California courts decide custody using the best interest standard. Under Family Code 3011, the judge weighs your child’s health, safety, and welfare, the nature and frequency of contact with each parent, any history of abuse, and whether either parent habitually uses controlled substances or abuses alcohol.1California Legislative Information. California Code FAM 3011 – Best Interests of the Child State policy puts the health, safety, and welfare of children above all other custody considerations.2California Legislative Information. California Code FAM 3020 – Legislative Findings and Declarations
Everything you write should connect back to one of those factors. Grievances about the other parent that have nothing to do with your child belong somewhere else, not in this document.
Children 14 and older have the right to address the court directly about custody or visitation unless the judge finds it would not be in the child’s best interest, and younger children’s wishes can also be considered when appropriate.3California Legislative Information. California Code FAM 3042 – Child’s Wishes Regarding Custody Do not write in your declaration that your child told you they want to live with you. That is hearsay, and the child’s preference reaches the court through its own channels.
Personal Knowledge Only
Every statement must be something you personally saw, heard, or did. California Evidence Code 702 makes testimony inadmissible unless the witness has personal knowledge of the matter.4California Legislative Information. California Code EVID 702 – Personal Knowledge Required California Rules of Court Rule 5.111 goes further for family law: every declaration must explain how you acquired your knowledge, and every statement must be admissible in evidence.5Judicial Branch of California. California Rules of Court Rule 5.111 – Declarations Supporting and Responding to a Request for Court Order
“I believe” and “I was told that” are warning signs. If your neighbor saw the other parent leave the children unsupervised, the neighbor needs to write their own declaration. You describe only what you observed yourself.
Specific Incidents, Not Characterizations
The gap between a persuasive declaration and a weak one almost always comes down to specificity. “The other parent is always late” is a conclusion. The judge cannot do anything with it.
Compare that with: “On March 8, 2025, the other parent was scheduled to pick up our daughter from school at 3:30 p.m. but did not arrive until 4:15 p.m. Our daughter was the last child waiting and was visibly upset when I arrived to get her after the school called me.” Date, time gap, observable effect on the child. That is what a judge can weigh.
Keep the tone calm and factual. Judges read emotional declarations constantly and tend to discount them. If the facts are as serious as you believe, a neutral presentation of specific incidents will be far more persuasive than any amount of venting.
A Workable Structure
Most custody declarations read well in this order:
- A short opening paragraph identifying who you are, your relationship to the child, and what you are asking the court to do.
- A background paragraph covering the current custody arrangement and how it came about.
- The factual body, organized either chronologically to show a pattern or thematically by topic (school, medical care, safety, communication). Each incident gets its own paragraph with a date, what happened, who was present, and the effect on your child.
- A closing paragraph that briefly connects the facts to the order you want the court to make.
- The penalty-of-perjury clause, date, city, and your signature.
Within the factual body, lead with your strongest, most concrete incidents. Judges do not always read every page with equal attention, and the first few pages carry the most weight.
Format and Length Rules
Which Form to Use
If you are the one asking for a custody order, you attach your declaration to the Request for Order (FL-300).6Judicial Council of California. Information Sheet for Request for Order If the other parent filed and you are responding, you use the Responsive Declaration to Request for Order (FL-320).7California Courts Self-Help Guide. Responsive Declaration to Request for Order (FL-320) Both forms give you only a small writing space, so your actual declaration almost always goes on separate attached pages formatted as pleading paper, with the form acting as a cover sheet.
Pleading Paper Requirements
California Rules of Court set specific requirements for the attached pages, and courts enforce them. A declaration that ignores the formatting rules can be rejected by the clerk or excluded by the judge.
- Standard 8½-by-11-inch white paper.
- Text one-and-a-half spaced or double-spaced, with lines numbered consecutively starting at 1 on each page.8Judicial Branch of California. California Rules of Court Rule 2.108 – Spacing and Numbering of Lines
- Line numbers at the left margin, separated from the text by at least a one-fifth-inch space or a vertical line, with at least three line numbers per vertical inch.8Judicial Branch of California. California Rules of Court Rule 2.108 – Spacing and Numbering of Lines
- A case caption on the first page with the court’s name, both parties’ names, the case number, and a document title such as “Declaration of [Your Name] in Support of [Request].”
Most word processors include pleading paper templates that handle the line numbering and margins automatically. If you are self-represented, use one.
Page Limits
A declaration supporting a Request for Order or a Responsive Declaration cannot exceed 10 pages. A reply declaration is capped at 5 pages. The only exceptions are declarations from expert witnesses and situations where the court grants permission to go longer.5Judicial Branch of California. California Rules of Court Rule 5.111 – Declarations Supporting and Responding to a Request for Court Order
Ten pages sounds like a lot until you start writing. Focus on facts that directly affect your child, not on relitigating every disagreement with the other parent.
The Penalty-of-Perjury Clause
Your declaration is legally meaningless without the right closing language. Code of Civil Procedure 2015.5 requires every declaration to include a statement under penalty of perjury, and the wording depends on where you sign.9California Legislative Information. California Code CCP 2015.5 – Unsworn Statement Under Penalty of Perjury
- Signed inside California: “I declare under penalty of perjury that the foregoing is true and correct.” Include the date and the city where you signed.
- Signed outside California: “I declare under penalty of perjury under the laws of the State of California that the foregoing is true and correct.” Include the date. The phrase “under the laws of the State of California” is what makes the declaration enforceable from another state.9California Legislative Information. California Code CCP 2015.5 – Unsworn Statement Under Penalty of Perjury
Sign immediately below the statement. Without the perjury clause, the date, and your signature, the court cannot consider the document. This is one of the most common mistakes self-represented litigants make, and the most avoidable. Perjury itself is a felony under Penal Code 118: anyone who willfully states something false under penalty of perjury, knowing it to be false, is guilty.10California Legislative Information. California Code PEN 118 – Perjury Stick to what you know to be true.
Protecting Sensitive Information
Redact personal identifiers before filing. If you need to reference a Social Security number or financial account number, use only the last four digits.11Judicial Branch of California. California Rules of Court Rule 1.201 – Protection of Privacy The clerk will not catch this for you. A full account number goes into the public file as-is.
Exhibits and Third-Party Declarations
Declarations become significantly stronger when documents back them up. Text messages, emails, school attendance records, medical records, photographs, and police reports can corroborate what you wrote. The key is tying each exhibit to a specific statement.
When referencing one, write: “A true and correct copy of [description of the document] is attached as Exhibit A.” Label the first page of that document “Exhibit A” at the bottom. Additional documents become Exhibit B, Exhibit C, and so on, with page numbering on multi-page exhibits.
Be selective. Fifty pages of text message screenshots when only three exchanges matter buries the evidence that counts and signals that you have not thought carefully about what is relevant.
You can also submit declarations from other people with firsthand knowledge of your child, such as teachers, childcare providers, relatives, neighbors, or therapists. These can carry significant weight, especially from professionals who interact with your child regularly. A third-party declaration follows the same rules as yours: pleading paper format, personal knowledge only, signed under penalty of perjury, within the 10-page limit.5Judicial Branch of California. California Rules of Court Rule 5.111 – Declarations Supporting and Responding to a Request for Court Order A teacher writing “I have observed that the child frequently arrives to school without completed homework on Mondays after spending the weekend with [parent]” is useful. A family friend writing about what someone else told them is hearsay and will be disregarded.
If any of those people will also testify live at the hearing, Family Code 217 requires a witness list filed and served in advance, briefly describing what each witness will say.12California Legislative Information. California Code Family Code FAM 217 Without that notice, the judge can refuse the testimony or continue the hearing.
After You Sign
File the original with the court clerk, then have someone 18 or older who is not a party serve a copy on the other parent or their attorney. California courts set specific deadlines for service that vary by motion type, and missing them can mean your declaration is not considered. For responsive declarations, service is generally required at least nine court days before the hearing.13California Courts Self-Help Guide. Serve Your Responsive Declaration The server completes a Proof of Service, which gets filed with the court.
Your declaration is not necessarily the final word. Under Family Code 217, the court generally must allow live testimony at family law hearings unless both parties agree to rely only on written declarations or the judge finds good cause to refuse live testimony and states the reasons on the record.12California Legislative Information. California Code Family Code FAM 217 The other parent can also file written objections to your declaration at least two court days before the hearing. Write every sentence as if you may have to defend it under cross-examination, because you very well might.