To file a child custody petition, you prepare a written petition and a sworn UCCJEA affidavit, submit them to the family court in the county where your child has lived for the last six months, pay a filing fee that usually falls between $100 and $400 (or apply for a waiver), and then arrange for a neutral third party to formally deliver the papers to the other parent. The steps below walk through each piece in the order you will actually encounter it.
Where to File
Custody jurisdiction is governed by the Uniform Child Custody Jurisdiction and Enforcement Act, which 49 states plus the District of Columbia have adopted. The primary rule is straightforward: you file in the child’s “home state,” meaning the state where the child has lived with a parent or a person acting as a parent for at least six consecutive months immediately before filing. For a child younger than six months, the home state is wherever the child has lived since birth.1U.S. Department of State. Uniform Child Custody Jurisdiction and Enforcement Act – Section 102
If a parent recently left the home state with the child but the other parent still lives there, the original state keeps jurisdiction for six months after the departure.2U.S. Department of State. Uniform Child Custody Jurisdiction and Enforcement Act – Section 201 The rule exists to stop forum shopping, so do not assume that moving changes where you file.
Within the correct state, file in the county where the child currently lives. Filing in the wrong county results in dismissal and forces you to start over, including paying the fee again.
The Emergency Exception
A court can take temporary emergency jurisdiction even when it is not the child’s home state if a child present in the state has been abandoned or if the child, a sibling, or a parent faces mistreatment or abuse.3Office of Juvenile Justice and Delinquency Prevention. The Uniform Child-Custody Jurisdiction and Enforcement Act The exception is narrow. Neglect alone does not qualify, and any resulting order lasts only long enough for a case to be filed in the home state.
The Forms You Need to Prepare
The core document is the petition itself, sometimes called a complaint. It tells the court exactly what arrangement you want. You need to specify whether you are asking for legal custody (the right to make major decisions about education, healthcare, and religion), physical custody (where the child lives day to day), or both. If you want a shared arrangement, spell out the proposed schedule. Vague requests like “reasonable visitation” leave too much to interpretation and often create problems later.
The petition asks for the full legal names and addresses of both parents and anyone else currently caring for the child, plus each child’s full name, date of birth, and current address. If you have safety concerns about disclosing your address, most courts allow you to file a request to keep that information confidential.
The UCCJEA Affidavit
Every custody case requires a sworn statement under the UCCJEA. This affidavit lists every address where the child has lived during the past five years, the names of each adult at those addresses, and information about any other court proceedings involving the child, including protective orders, domestic violence cases, and adoption proceedings.4U.S. Department of State. Uniform Child Custody Jurisdiction and Enforcement Act – Section 209 Courts take accuracy on this form seriously. Omitting an address or failing to disclose a related proceeding can lead to sanctions or dismissal, and the other side will use inaccuracies to challenge the court’s authority.
Summons
A summons notifies the other parent that a case has been filed and tells them how long they have to respond. That deadline varies by jurisdiction but typically falls between 20 and 30 days. Blank summons forms are usually available at the county clerk’s office or on your state’s judicial branch website.
Financial Disclosure
When child support is also at issue, many courts require a financial disclosure or income-and-expense declaration alongside the petition. This form details your income, monthly expenses, and assets so the court can calculate support. Even in cases focused solely on custody, some jurisdictions require financial information to confirm the proposed arrangement is economically feasible. Check your local court’s required forms list before filing so you do not have to make a second trip.
Filing Fees and Fee Waivers
The clerk of court charges a filing fee to open your case, and the amount depends entirely on where you live. Fees across the country range from under $100 to over $400, with some jurisdictions charging more. The clerk will not accept your paperwork unless you pay the full fee upfront or receive a waiver.
If you cannot afford the fee, apply for a waiver. Courts use different names for the application: request to waive fees, pauper’s affidavit, or a request to proceed in forma pauperis.5National Center for State Courts. Civil Fee Waivers: A Necessity for Access Whatever the label, the form asks you to disclose income, bank balances, monthly expenses, and any government benefits you receive.
Eligibility criteria vary. Some states tie approval to the federal poverty level, while others automatically approve waivers for anyone already receiving public assistance like SNAP or Medicaid.5National Center for State Courts. Civil Fee Waivers: A Necessity for Access For reference, the 2026 federal poverty guideline for a family of three in the contiguous 48 states is $27,320 per year.6U.S. Department of Health and Human Services. 2026 Poverty Guidelines Attach recent pay stubs, benefit letters, or tax returns to support your application. Courts that deny waivers typically allow you to request a payment plan instead.
Filing fees are only the starting point. Service of process runs roughly $35 to $150 for a private process server depending on location and the number of attempts needed. If you hire a family law attorney for a contested case, initial retainer fees commonly fall between $2,500 and $5,000, with the total climbing based on the number of hearings, motions, and evaluations. Even parents representing themselves should budget for copies, certified documents, and potential mediation fees.
Submitting the Petition
Many courts now offer electronic filing portals where you upload documents and pay online. If you file in person, bring at least two extra copies of everything so the clerk can stamp one set for you and one set for service on the other parent. Once the clerk processes your filing, you receive a case number and a file-stamped copy that proves your case is officially open.
Serving the Other Parent
After filing, you must formally deliver the documents to the other parent through a process called service of process. You cannot hand the papers over yourself. A neutral third party, either a professional process server or a sheriff’s deputy, must make the delivery and then complete a sworn proof of service form that you file back with the court. This step satisfies the constitutional requirement that the other parent receive proper notice before any court can act.
If You Cannot Locate the Other Parent
If you genuinely cannot find the other parent despite a thorough search, most states allow service by publication. This typically requires a sworn statement describing every effort you made to locate the person, including checking last-known addresses, contacting relatives, and searching public records. If the court finds your search was diligent enough, it will authorize publication of a notice in a local newspaper and sometimes on a court website. The other parent then has a set number of days after publication to respond. Courts view service by publication as a last resort, and a sloppy search can give the absent parent grounds to reopen the case years later.
If the Other Parent Does Not Respond
When the other parent fails to file a response within the deadline stated in the summons, you can ask the court to enter a default. In theory, the judge could then grant your petition as written. In practice, family courts are reluctant to decide custody by default. Judges overwhelmingly prefer both parents to participate in decisions about children, and many will order additional efforts to contact the non-responding parent or appoint an attorney to represent their interests before ruling.
If the court does grant a default judgment, the absent parent may later petition to set it aside by showing good cause for missing the deadline. A custody order entered by default is more vulnerable to being reopened than one reached after both sides participated.
If the Child Is in Immediate Danger
You do not have to wait for the standard process when a child is at immediate risk. Emergency orders, sometimes called ex parte orders because a judge can issue them without the other parent present, are available when there is an immediate risk of harm. Qualifying situations include recent or ongoing physical abuse, sexual abuse, domestic violence, or a credible threat that the other parent will flee the state with the child.
The bar is high on purpose. You need specific facts, not opinions. Courts want dates of incidents, descriptions of what happened, and any police reports or medical records that back up your account. An emergency order is temporary by nature and typically stays in effect only until the court can hold a hearing where both parents are present, usually within a few weeks.
What Happens After You File
A contested custody case can take many months to resolve. Most courts can issue temporary custody orders (sometimes called pendente lite orders) that govern where the child lives, set a visitation schedule, and often address temporary child support while the full case works through the system. Either parent can request one shortly after filing.
Mediation
A growing number of states require parents to attempt mediation before a custody case goes to trial. A neutral third party meets with both parents to help negotiate an arrangement without a judge deciding for them. The mediator does not take sides, make custody decisions, or give legal advice. Discussions are confidential, so neither parent can use what the other said in mediation as ammunition at trial. The main exception is when the mediator has concerns about unreported child abuse or hears a threat of violence. Courts typically waive the requirement in cases involving documented domestic violence, substance abuse, or when one parent lives far from the courthouse. If mediation produces an agreement, the judge usually approves it as the final order.
Parent Education
Forty-six states mandate some form of parent education in custody or divorce cases, and sixteen states require every divorcing parent to attend a court-approved class. Programs range from a single two-hour session to a multi-week course, covering how parental conflict affects children, communication strategies for co-parenting, and the emotional stages children go through during family transitions. Fee waivers are often available. Completing the requirement is a condition of moving your case forward.
Custody Evaluations
In highly contested cases, a judge may order a custody evaluation conducted by a licensed psychologist or mental health professional. The evaluator interviews both parents and the child, observes each parent-child interaction, reviews school and medical records, and contacts third parties like teachers and pediatricians. The process takes at least two months and sometimes longer when serious allegations of abuse are involved. The evaluator produces a written report with recommendations that carries significant weight, though the judge is not bound to follow it. Parents typically share the cost, and it is not cheap.
Who Can File Besides Parents
Either biological parent can file regardless of whether the parents were ever married. For unmarried fathers, establishing paternity first is often necessary before a court will address custody, either through a voluntary acknowledgment of paternity or a court-ordered DNA test.
Grandparents, stepparents, and other non-parent caregivers may also have standing to file in some circumstances, though the rules vary significantly from one state to another and the threshold is higher than for biological parents. Grandparents most commonly gain standing when a parent has died, the parents have divorced, or the child has been living with the grandparent for an extended period. Some states require non-parent petitioners to show that granting them custody serves the child’s best interests and that the child would face harm without it. If you are not the child’s biological or adoptive parent, check your local court’s self-help resources or consult a family law attorney before filing.