How Does Custody Work for Unmarried Parents Living in Different States in Arizona?

Who Has Custody When Unmarried Parents Are Not Together?

Under A.R.S. § 25-409(A), an unmarried mother in Arizona has sole legal custody of the child from birth. The father has no legal custodial rights until he establishes paternity and obtains a court order. This is a critical distinction — without a paternity action, the father (and his family) cannot legally demand parenting time or decision-making authority.

Approximately 40% of all births in the United States are to unmarried parents, according to the CDC, and interstate custody disputes among unmarried parents have risen substantially over the past decade.

How Does Paternity Affect Custody Rights?

Before the father can request any legal decision-making or parenting time, he must establish paternity through one of two methods under Arizona law:

1. Voluntary Acknowledgment of Paternity — Both parents sign an affidavit at the hospital or later through the Arizona Department of Economic Security.
2. Court-Ordered Paternity — Either parent files a paternity action under A.R.S. § 25-803, which may include genetic testing.

Even after paternity is established, the father must separately petition for legal decision-making (custody) and parenting time. Establishing paternity alone does not automatically grant 50/50 custody.

Which State Has Jurisdiction Over Custody?

The Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA), adopted in Arizona under A.R.S. § 25-1031, determines which state's courts can hear a custody case. The key rule is home state jurisdiction: the state where the child has lived for at least six consecutive months before the filing has authority.

If your baby is born in Arizona and lives here, Arizona is the home state. The father moving to California does not change this. California courts would generally decline jurisdiction under these circumstances, meaning any custody case would be filed and heard in Arizona.

What Factors Does Arizona Consider for Parenting Time?

When a court evaluates parenting time, A.R.S. § 25-403 lists over a dozen best-interest factors, including:

• The relationship between the child and each parent
• The child's adjustment to home, school, and community
• Each parent's mental and physical health
• Which parent is more likely to allow frequent and meaningful contact with the other parent
• Any history of domestic violence, abuse, or neglect — documented abuse by either party is taken very seriously and can significantly limit parenting time

Arizona family courts granted sole or primary custody to one parent in roughly 48% of contested cases in recent years, particularly when distance, instability, or safety concerns are present.

Does Distance Between Parents Affect Custody Arrangements?

A 50/50 parenting time schedule becomes impractical when parents live 300+ miles apart. Arizona courts recognize this reality. For long-distance arrangements, courts typically award primary physical custody to one parent and structured visitation (such as extended summer and holiday time) to the other. The court also considers which parent has stable housing, income, and a support system — factors outlined in our Arizona divorce checklist that apply equally to unmarried custody cases.

The fact that the father has no independent income, no vehicle, and relies entirely on his mother is relevant. Courts assess each parent's ability to provide for the child's day-to-day needs.

What Should You Do Next?

Given the complexity of interstate custody and the mention of mutual abuse, taking action now is critical:

• Document everything — texts, incidents, and any evidence of abuse from either side
• File first in Arizona — establishing jurisdiction here protects your position; review Arizona divorce resources for court forms and legal aid
• Consult a family law attorney — an Arizona attorney experienced in unmarried parent cases can file a paternity response or custody petition; find a local attorney through our directory
• If there is domestic violence, contact the Arizona Coalition to End Domestic Violence (602-279-2900) for safety planning

Review the Arizona divorce statistics page for data on custody outcomes, and explore our Divorce Questions hub for related custody topics. Because both parties have acknowledged abuse, the court may order supervised parenting time or require completion of domestic violence intervention programs before awarding unsupervised time to either parent.