To establish de facto parentage in Washington, you file a verified petition in the Superior Court of the county where the child lives and prove all seven factors in RCW 26.26A.440 by a preponderance of the evidence. If the court grants the petition, you become a legal parent with the same rights and obligations as a biological or adoptive parent, including residential time, decision-making authority, and child support.
Who Can File, and by When
Only the person claiming to be the de facto parent can bring the petition. A grandparent, other relative, or family friend cannot file on your behalf. You must be alive when the case starts, and so must the child.
File before the child turns eighteen. Once the child reaches adulthood, the court has no authority to adjudicate the claim. There is no minimum waiting period in the statute, but you need enough shared history to satisfy every one of the seven factors, so filing too early can sink an otherwise strong case.
The Seven Factors You Have to Prove
The court evaluates the factors as a package. Missing even one requires denial, so build evidence for each before you file.
- You resided with the child for a significant period as a regular member of the household, not as an occasional visitor. The statute does not fix a specific length of time, so longer and more consistent cohabitation strengthens this factor.
- You engaged in consistent caretaking — meals, homework, bedtime routines, school drop-offs, medical appointments. Sporadic involvement is not enough.
- You took on full and permanent parental responsibilities without expectation of financial compensation. This is what separates a parental role from a paid nanny, babysitter, or foster arrangement.
- You held the child out as your own, publicly and consistently — introducing the child as your son or daughter, showing up at parent-teacher conferences as a parent, being known in the community that way.
- You have a bonded, dependent relationship with the child that is parental in nature. The child looks to you as a parent emotionally, not just logistically.
- Another legal parent fostered or supported that bond. A legal parent who objected throughout undermines this factor. Passive tolerance is weaker than active co-parenting.
- Continuing the parent-child relationship is in the child’s best interest going forward.
These come directly from RCW 26.26A.440(4). Some older summaries describe only four factors; that is inaccurate, and relying on it will produce an incomplete petition.
Preparing the Petition
The form is the Petition for De Facto Parentage, FL Parentage 341, on the Washington Courts website. It must be verified, meaning you sign it under penalty of perjury.
Expect to provide identifying details for yourself, the child, and every legal parent or guardian: full names, dates of birth, current addresses. The form asks about the child’s current living situation and the history of your relationship with the child.
The narrative sections matter most. You have to explain, factor by factor, how your situation satisfies the statute. Be concrete. Instead of “I helped raise the child,” write something like “From September 2019 through June 2024, I lived with the child at [address], drove her to school each morning, attended every parent-teacher conference, and split bedtime duties with [legal parent’s name].” Include dates, names of schools and doctors, and specifics about how the legal parent supported your role. The court’s first look at your case is the pleading itself, so thin writing at this stage often ends the case before you get to a hearing.
Filing and Serving the Petition
File in the Superior Court for the county where the child lives. Filing fees vary; in King County the Uniform Parentage Act filing fee is $310. If you cannot afford it, ask the court for a fee waiver.
You then have to serve the verified petition on every legal parent, every legal guardian, and any other party to the case. Both legal parents must be served, not just the one you have a relationship with. Service follows Washington’s standard civil rules, which generally means personal delivery by someone who is not a party — a process server or the sheriff’s office.
After service, the other parties can file a verified response. Their pleading is also signed under penalty of perjury and may contest your version of events.
How the Court Decides the Case
The Standing Screen
Before any full hearing, the court reviews your verified petition and any responses to decide whether you have standing. The question at this stage is whether the facts you have alleged, if true, would satisfy all seven factors. If facts are disputed, the court may hold an expedited hearing to sort them out. If any factor is unsupported on paper, the case ends here. Petitions that rely on vague, conclusory statements often fail at this screen without ever reaching an evidentiary hearing.
The Full Hearing
If you clear the standing screen, you have to actually prove each factor by a preponderance of the evidence — more likely than not. Useful evidence typically includes:
- Testimony from teachers, pediatricians, and family friends who saw you in the parental role
- Photographs and communications showing your involvement over time
- Financial records reflecting expenses you paid for the child
- School and medical records that list you as a parent or emergency contact
- The child’s own statements or testimony, depending on age
If a legal parent opposes the petition, expect much of the hearing to focus on the sixth factor: whether that parent genuinely fostered your relationship with the child or merely tolerated it.
What You Get, and Owe, After Recognition
A granted petition makes you a legal parent, full stop. It is not a lesser or temporary status.
Parenting Plan and Residential Time
You are entitled to a parenting plan under RCW 26.09.187, which allocates residential time and decision-making authority over education, healthcare, and religious upbringing. The court decides based on the child’s best interests, looking at each parent’s history of involvement in decisions and the parents’ ability to cooperate. Agreed plans that serve the child’s welfare are generally approved.
Child Support
Full parental status carries full financial responsibility. A de facto parent can be ordered to pay child support under Washington’s child support schedule. If the child lives primarily with you, another legal parent may owe support to you.
Birth Certificate
Washington allows a parent’s name to be added or changed on a birth certificate through a court order. You can submit the de facto parentage order to the Washington Department of Health to have your name added.
Inheritance
A de facto parentage order establishes the legal parent-child relationship, which triggers Washington’s intestacy rules in both directions when there is no will.
If the Court Denies the Petition
If any factor is missing, the petition must be denied. The findings form, FL Parentage 345, has a denial checkbox at each factor, and a single “no” finding ends the case. No parenting plan is entered, no support obligation is created, and no birth certificate change is made.
You are not permanently barred from filing again if circumstances genuinely change, but the record from the first case will be hard to overcome. If you believe the denial rested on a legal error, you can appeal to the Court of Appeals under Washington’s appellate rules, though family law appeals are expensive and the trial court’s factual findings carry significant weight on review.
Practical Points Before You File
An attorney is not required, but these are among the more complex family law cases in Washington. Seven factors, a verified pleading, a standing screen, and a contested hearing add up to a proceeding that is hard to navigate alone. If cost is an issue, contact your county’s legal aid organization or the Washington State Bar Association’s lawyer referral service.
Budget beyond the filing fee. You may pay for service of process, copies of school and medical records, and possibly a guardian ad litem if the court appoints one for the child. Even an uncontested case can take months.
The strongest petitions rest on documentation gathered while events are happening, not reconstructed later. If you are in a parental role now, save text messages in which the legal parent refers to you as the child’s parent, keep receipts for the child’s expenses, photograph events you attend, and make sure your name appears on school enrollment forms and medical intake paperwork. Contemporaneous evidence carries far more weight at hearing than testimony that depends on memory years down the line.