Third party custody in Washington state is handled through a court process called minor guardianship, and the people who can file are defined broadly: any adult with a genuine interest in the child’s welfare, and the child themselves if they are old enough. Washington replaced its older nonparental custody system with the Uniform Guardianship Act in Chapter 11.130 RCW, and the standard a non-parent has to meet is deliberately high.1Washington State Legislature. Washington Code 11.130.185 – Basis for Appointment of Guardian for Minor Being willing and able to raise the child is not enough on its own. The court has to find that the arrangement is in the child’s best interest and that one of three specific legal grounds exists.
Who Qualifies to File a Petition
The statute allows “a person interested in the welfare of a minor, including the minor” to petition for guardianship.2Washington State Legislature. Washington Code 11.130.190 – Petition for Appointment of Guardian for Minor That language is intentionally wide. You do not need a biological or legal tie to the child. Grandparents, aunts, uncles, adult siblings, stepparents, and close family friends all qualify. A child who is 12 or older can even file on their own behalf.
In practice, judges give weight to an existing, meaningful relationship with the child. A grandmother who has been helping raise a grandchild for years is in a stronger position than a relative who recently learned about the situation. Nothing in the statute bars a petition from someone without a prior caregiving role, but the depth of your connection, and your ability to provide a stable home, will matter when the court evaluates the case.
The Legal Grounds the Court Must Find
Filing is open; winning is not. A petition is not a claim that you would be a better parent than the people raising the child. Before appointing a non-parent as guardian, the court must find both that the appointment serves the child’s best interest and that at least one of three conditions is present.1Washington State Legislature. Washington Code 11.130.185 – Basis for Appointment of Guardian for Minor
- Each parent, after being fully informed about what a guardianship means, consents to it.
- All parental rights have already been legally terminated in a separate proceeding.
- Clear and convincing evidence shows that no parent is willing or able to exercise parenting functions.
Most contested third-party cases turn on the third ground, and the burden is heavy. Clear and convincing evidence is a higher standard than the “more likely than not” test used in ordinary civil cases. You have to show that a parent cannot adequately handle the core responsibilities of raising the child: decisions about education and medical care, daily physical and emotional needs, and a safe, stable home. Situations that commonly meet this threshold include long-term incarceration, severe untreated substance abuse, prolonged abandonment, and serious mental health conditions that leave a parent unable to function as a caregiver.
Who Gets Priority When More Than One Person Could File
If several people are potential petitioners, Washington’s priority list tells you where you stand. When the court decides a guardianship is warranted, it chooses the guardian in this order:3Washington State Legislature. Washington Code 11.130.215 – Order of Appointment, Priority
- A person nominated by a parent, in a will or another sworn document, gets first priority unless the court finds that appointment would harm the child.
- A person nominated by the child, if the child is 12 or older, gets next priority.
- If neither applies, the court appoints whoever best serves the child’s interests.
The court can also enter a limited guardianship instead of a full one, restricting the guardian’s authority to specific areas while the parent keeps other decision-making rights.3Washington State Legislature. Washington Code 11.130.215 – Order of Appointment, Priority This happens more often than people expect. A parent dealing with a temporary crisis may lose day-to-day custody but keep the right to make medical or educational decisions. A guardianship is not the same as termination of parental rights; the order spells out what each parent retains, and contact with the parent is preserved unless the court finds it should be restricted.
Filer Situations That Change the Picture
A Parent Who Cannot Be Found
If a parent has disappeared and you cannot locate them despite reasonable efforts, Washington allows service by publication, which means publishing a legal notice in a newspaper after filing an affidavit explaining that you were unable to find the parent within the state.4Washington State Legislature. Washington Code 4.28.100 – Service of Summons by Publication, When Authorized Courts take this seriously. Before approving publication, the judge will want evidence of your actual search efforts, not just a statement that you do not know where the parent lives.
A Parent on Active Military Duty
Federal law adds protections when a parent is a service member. The Servicemembers Civil Relief Act requires the court to appoint an attorney for an absent service member and grants an automatic stay of at least 90 days when military duties prevent participation.5Military OneSource. Servicemembers Civil Relief Act The court can grant additional 90-day extensions. Filing a petition against a deployed parent without accounting for these protections can get the entire case thrown out.
Who Lives in Your Home
Before the court enters a final guardianship order, the proposed guardian and every adult living in that household must pass criminal background checks: both a Washington State Patrol check and a national criminal history check.6Washington State Legislature. Washington Code Chapter 11.130 – Uniform Guardianship, Conservatorship, and Other Protective Arrangements Act This catches people off guard when an adult child, a partner, or a roommate shares the home. Everyone gets screened, and the fingerprinting and processing can add weeks to your case.
What You File
The petition is a court form, GDN M 102, available on the Washington Courts website.7Washington State Courts. Request a Minor Guardianship You file it, along with your supporting documents, with the Superior Court clerk. The base filing fee for a probate proceeding is $200, and counties add surcharges that can push the total higher.8Washington State Legislature. Washington Code 36.18.020 – Clerk’s Fees, Surcharges If you are a relative of the child, you do not have to prepay the filing fee. A non-relative who cannot afford it can ask the court for a fee waiver based on financial hardship.
The petition itself asks for identifying information about the child, the parents, and you; the name of anyone who had primary care of the child for at least 60 days in the past two years or 730 days in the past five years; which of the three statutory grounds you are relying on; the name of the person you want appointed; a description of any significant property the child owns; and whether any other custody proceeding is pending.2Washington State Legislature. Washington Code 11.130.190 – Petition for Appointment of Guardian for Minor
The factual heart of your case goes into a separate document, the supplemental declaration, not the petition form.2Washington State Legislature. Washington Code 11.130.190 – Petition for Appointment of Guardian for Minor This is where you lay out, concretely, why the guardianship is necessary and in the child’s best interest. Dates, specific incidents, and observable effects on the child carry more weight than general characterizations. Saying “the mother has a substance abuse problem” is not enough; the court will want to know what you have seen, when, and how it affected the child. Police reports, Child Protective Services records, medical and school records, and witness declarations from people with firsthand knowledge all strengthen the picture.
What Happens After You File
Once the petition is filed, every parent and every existing guardian must be personally served, as must the child if they are 12 or older. Grandparents, adult siblings, long-term caregivers, and anyone the child or a parent has nominated as guardian receive notice by mail.9Washington State Legislature. Washington Code 11.130.195 – Notice of Hearing for Appointment of Guardian for Minor The court can waive mail notice for good cause, including when notifying someone could put the child at risk.
The hearing is not a formality. The judge weighs the petition, the supplemental declaration, any evidence, and the positions of the parents. A parent who opposes the guardianship has the right to appear, present evidence, and be represented by an attorney. A child who is 12 or older is entitled to attend, can communicate directly with the court, and can ask that the court appoint an attorney to represent them. The court may also appoint a guardian ad litem, an independent investigator who reports to the judge on what arrangement would best serve the child. GAL hourly rates typically range from $150 to $275, with courts often requiring an initial deposit of $500 to $2,000, and the judge decides which party pays.