Paternity Action Filed by a Child in Arizona: Filing, Testing, and Support

A paternity action filed by a child in Arizona is allowed under A.R.S. § 25-803: a minor child acts through a guardian, conservator, or “next friend” — any responsible adult willing to file on the child’s behalf — while an adult child age 18 or older can bring the case directly in their own name. The result is a court decree that creates a legal parent-child relationship with the alleged father, which in turn unlocks child support, inheritance rights, health coverage, and Social Security benefits.

Who Can File for the Child

A.R.S. § 25-803(A) lists five categories of people allowed to start a paternity case: the mother, the father, the guardian or conservator or “best friend” of a child born outside marriage, a county public welfare agency, and the state through the Department of Economic Security.¹ The child isn’t named directly, but the “best friend” category is the opening. “Best friend” is an older legal term meaning the same thing as “next friend” — an adult who steps in to file a lawsuit for someone who can’t file alone. A parent, grandparent, aunt, uncle, or any other responsible adult can take that role for a minor child born outside of marriage.

Once the child turns 18, no next friend is needed. Section 25-803(B) says an adult may bring an action to establish the adult’s biological parent.¹ The statute sets no upper age limit, and the Maricopa County Superior Court’s self-service forms for adult paternity require only that the petitioner be 18 or older and that paternity has not already been legally established. An adult child can file at 25, 40, or later, as long as no prior legal determination of paternity exists.

Try Voluntary Acknowledgment First

If the alleged father is willing to acknowledge the relationship, a full court case may be unnecessary. Under A.R.S. § 25-812, both parents can establish paternity by signing a notarized or witnessed acknowledgment statement and filing it with the Superior Court clerk, the Department of Economic Security, or the Department of Health Services.² The parents can also agree to be bound by genetic test results and file a lab affidavit confirming the tested man wasn’t excluded.

Once the clerk receives a valid acknowledgment, the clerk issues an order establishing paternity that carries the same force as a Superior Court judgment.² Copies go to both the Department of Health Services and the Department of Economic Security. This route skips the cost and delay of a contested proceeding. It only works, though, when the alleged father cooperates. If he denies the relationship or refuses to sign anything, a formal petition is the way forward.

Preparing and Filing the Petition

A formal Petition to Establish Paternity is filed in the Arizona Superior Court for the county where the child lives. The Arizona Judicial Branch publishes statewide forms through its self-service center, and some counties use their own versions.³ The petition needs:

Full legal names and current addresses for the mother, the child, and the alleged father.
The child’s date and county of birth.
A brief explanation of why the petitioner believes the named man is the biological father, and any existing relationship between the child and the alleged father.
A request that the court order DNA testing.

If the child is a minor, the petition must identify the next friend or guardian filing on the child’s behalf. A Confidential Sensitive Data Form has to accompany the petition because Arizona court rules require filers to redact Social Security numbers, bank account numbers, and driver’s license numbers from documents that become part of the public record. Those details go on the separate confidential form, which the clerk keeps restricted to the parties, their attorneys, and court staff.⁴

Filing Fees and Fee Waivers

Filing fees vary by county. The statewide fee schedule lists a domestic relations petition at $191 when no specific fee is prescribed, while Coconino County charges $341 for a paternity or maternity filing.⁵ Check the local court’s current schedule before filing.

If the filing fee is out of reach, Arizona’s Code of Judicial Administration allows an application for a deferral or waiver. A deferral postpones all fees until the case concludes and is generally available to anyone whose gross monthly income is at or below 150 percent of the federal poverty level, or who receives benefits through programs like TANF or food assistance. A full waiver applies when the applicant is permanently unable to pay or receives Supplemental Security Income.⁶ The application goes in at the same time as the petition.

Serving the Alleged Father

The alleged father must receive formal notice of the paternity action before the case can move forward. Under Rule 41 of the Arizona Rules of Family Law Procedure, service can be made by:⁷

Personal delivery by a private process server or county sheriff.
Leaving copies at the person’s home with a resident of suitable age and discretion.
Restricted-delivery mail that requires the addressee’s signature, if the address is known and in the United States.

Private process servers typically charge between $60 and $300, depending on how hard the person is to locate. After service, a proof-of-service document has to be filed with the court; without it, the case stalls. If the alleged father cannot be served within 120 days, the court will either dismiss the case without prejudice or set a deadline for completing service.⁸

If the Alleged Father Doesn’t Respond

Once served, the alleged father has 20 days to file a written response if served within Arizona, or 30 days if served outside the state.⁹ Ignoring the summons doesn’t make the case disappear. If no response arrives, the petitioner can ask the clerk to enter a default.

Arizona’s family law rules allow the court to enter a default judgment of paternity based on an affidavit from a parent establishing the factual basis for the finding, plus proof that jurisdictional requirements were met.¹⁰ If child support is also requested, the motion must include child support worksheets and an affidavit estimating the defaulting parent’s income. The court can only order what the original petition asked for, so the petition itself needs to be thorough from the start. A default judgment carries the same legal weight as one entered after a full trial.

Genetic Testing and the 95 Percent Presumption

When the alleged father denies paternity, DNA testing resolves it. Under A.R.S. § 25-807, the court can order genetic testing on its own or at any party’s request. The statute directs the mother, the child, and the alleged father to submit to testing at an accredited laboratory.¹¹ If the mother is unavailable or refuses, the court can proceed with testing the alleged father and child alone. Paternity cases take priority over other civil matters, and the court must set the case for trial within 60 days of the respondent’s answer.

Courts in paternity cases almost universally require testing through laboratories accredited by AABB, which has set relationship-testing standards since 1982.¹² Court-ordered testing typically costs between $300 and $500, and the court decides how the cost is split.¹¹

If the results show a 95 percent or greater probability of paternity, Arizona law presumes the man is the father. The burden then shifts: the person opposing paternity must present clear and convincing evidence that the man is not the father, which is a very hard standard to meet against modern DNA analysis.¹³ The lab’s report is automatically admissible unless a written challenge is filed within 20 days. If challenged, the court can order a second round of testing at the challenging party’s expense.

Refusing a court-ordered test carries real consequences. Arizona courts can enforce testing orders through their contempt powers, including fines or jail time. Refusal can also be used against the person: judges can draw negative inferences and establish paternity on the remaining evidence.

What the Decree Gives the Child

Once the court is satisfied, the judge signs a Decree of Paternity. It is a binding order that creates a full legal parent-child relationship and triggers a set of rights that didn’t exist before.

Child Support

The court will order one or both parents to pay child support under Arizona’s guidelines. Support continues until the child turns 18, or 19 if the child is still in high school or an equivalency program. If the child has a severe mental or physical disability that prevents independent living, the court can extend support past the age of majority. The decree can also order either parent to pay the actual expenses of pregnancy, childbirth, and genetic testing, with billing statements serving as sufficient evidence of the amounts owed.¹⁴

Retroactive Support

This is where the financial stakes climb. When paternity is established during the child’s minority, the court must calculate past support owed by applying current guidelines retroactively. The default rule limits retroactive support to the three years before the petition was filed. The court can reach further back if it finds good cause after weighing why the person seeking support waited, whether the alleged father actively impeded the process, and how diligently the petitioner attempted service.¹⁴ A father who avoided service for years should not expect the three-year limit to shield him.

Inheritance, Insurance, and the Birth Certificate

Without a decree, a child born outside marriage has no automatic right to inherit from the father if he dies without a will. Establishing the legal relationship entitles the child to inherit under Arizona’s intestacy laws on the same terms as any other child of the father. The decree also qualifies the child for health insurance through the father’s employer and for veteran’s benefits or workers’ compensation survivor benefits where applicable.

After the court enters the decree, it can be submitted to the Arizona Department of Health Services to amend the child’s birth certificate to add the father’s name. A voluntary acknowledgment under § 25-812 triggers that notice automatically; with a court decree, the petitioner typically submits the order and pays the state’s amendment fee directly.

Social Security Survivor Benefits

One of the most financially significant reasons to file is qualifying the child for Social Security benefits on the father’s record. If the father becomes disabled or dies, an eligible child can receive monthly payments. The Social Security Administration needs proof that a legal parent-child relationship exists, and a paternity decree satisfies that requirement. When the father’s name appears on the birth certificate following a court order, the SSA treats the child the same as a child born within marriage.¹⁵

If no decree was obtained during the father’s lifetime, the SSA will accept other evidence: hospital or school records, a physician’s statement, evidence the parents lived together at conception, and statements from relatives with personal knowledge.¹⁵ A court decree eliminates that evidentiary scramble. Filing while the father is alive, when DNA testing is straightforward, is far easier than trying to prove the relationship after death.

1
Arizona Legislature. Arizona Code 25-803 – Persons Who May Originate Proceedings; Legal Decision-Making; Parenting Time; Conciliation Court
2
Arizona Legislature. Arizona Code 25-812 – Voluntary Acknowledgment of Paternity; Action to Overcome
3
Arizona Judicial Branch. Paternity
4
Yavapai County Courts. Confidential Sensitive Data Form Instructions
5
Arizona Judicial Branch. Superior Court Filing Fees
6
New York Codes, Rules and Regulations. Arizona Code of Judicial Administration 5-206 – Fee Deferrals and Waivers
7
New York Codes, Rules and Regulations. Arizona Rules of Family Law Procedure – Rule 41
8
New York Codes, Rules and Regulations. Arizona Rules of Family Law Procedure – Rule 40 – Summons
9
New York Codes, Rules and Regulations. Arizona Rules of Family Law Procedure – Rule 24.1 – Time for Filing and Serving a Response to a Petition
10
New York Codes, Rules and Regulations. Arizona Rules of Family Law Procedure – Rule 44.1 – Default Decree or Judgment
11
Arizona Legislature. Arizona Revised Statutes 25-807 – Precedence of Maternity and Paternity Proceedings; Delay for Paternity Tests; Court Order; Evidentiary Use; Alternative Tests; Out-of-State Orders; Immunity
12
AABB. AABB-Accredited Relationship (DNA) Testing Facilities
13
Arizona Legislature. Arizona Revised Statutes 25-814 – Presumption of Paternity
14
Arizona Legislature. Arizona Code 25-809 – Judgment and Order
15
Social Security Administration. What Other Evidence Proves Paternity?