Child custody: the terms, the standard, and why the answer depends on your state

The two dimensions of custody

Child custody has two separate dimensions, and each can be arranged independently:

• Legal custody — the authority to make major decisions about the child: school, non-emergency health care, and religious upbringing.
• Physical custody — where the child lives day to day.

Each dimension is further described as joint (shared by both parents) or sole (held by one parent). A common arrangement is joint legal custody with one parent holding primary physical custody and the other having a parenting-time schedule.

The standard: “best interest of the child”

Every state decides custody by a “best interest of the child” standard. But the specific factors a court weighs — stability of the home, each parent’s caregiving history, the child’s ties to school and community, and so on — are defined by state law and vary by state. There is no federal list of factors; this is one of the most state-specific areas of family law.

Which court can decide — and which order counts

Two frameworks govern the forum and the respect given to custody orders:

• UCCJEA (state law). The Uniform Child Custody Jurisdiction and Enforcement Act, adopted by nearly every state, says the court of the child’s “home state” — generally where the child has lived for the prior six months — has authority to decide or modify a case. This prevents two states from issuing conflicting orders.
• PKPA (federal). The Parental Kidnapping Prevention Act, at 28 U.S.C. § 1738A, requires states to give full faith and credit to another state’s custody determination, provided it was made consistently with the Act’s jurisdictional rules. It is a federal floor on interstate recognition, not a federal standard for how custody is decided.

Modification and parenting time

Custody and visitation (often called parenting time) can be modified when there is a material change in circumstances and the modification serves the child’s best interest, under state law. The schedule itself — how overnights are split — is set by the parenting plan and the court’s order, not by the label “joint.”

The bottom line

Custody rests on state law: the legal/physical split, the best-interest factors, and the schedule all come from your state. The federal pieces are narrow — the PKPA’s requirement that valid out-of-state orders be honored, and the UCCJEA’s home-state rule for which court decides.

This article is general legal information, not individualized legal advice. Custody law varies by state and changes; consult your state’s statutes and a local attorney for a specific situation.