Custody & Co-Parenting Glossary: 20 Terms Every Separated Parent Should Know

Separation comes with a vocabulary nobody hands you. This glossary defines 20 of the terms you will meet most often in custody paperwork, mediation and everyday co-parenting, in plain language. These are general, dictionary-style explanations to help you follow a conversation — not legal definitions. Precise legal meanings, and even the exact words used, vary by jurisdiction, so confirm anything that affects your case with a family-law attorney.

Custody types & roles

Legal custody

Legal custody is the authority to make major decisions about a child's life — typically schooling, medical care, religion and overall welfare. It is separate from where the child lives day to day. A parent can share legal custody while spending less physical time with the child. What counts as a "major" decision varies by jurisdiction.

Physical custody

Physical custody is the arrangement that determines where a child lives and which parent provides day-to-day care and supervision. It is distinct from legal custody, which concerns decision-making. Physical custody can be shared roughly equally between two homes or held primarily by one parent, with the other having scheduled parenting time. Terminology differs across jurisdictions.

Joint (shared) custody

Joint custody, also called shared custody, is an arrangement in which both parents share responsibility for the child — decision-making authority (joint legal custody), living time (joint physical custody), or both. Joint custody does not automatically mean a perfectly equal 50/50 split of days; it signals shared involvement, with the exact division set by the parenting plan and local law.

Sole custody

Sole custody is an arrangement in which one parent holds custody rights — legal, physical, or both — while the other parent may have limited or supervised time, or in some cases none. Sole legal custody lets one parent make major decisions alone. The circumstances in which sole custody is awarded vary widely by jurisdiction.

Custodial parent

A custodial parent is the parent with whom a child primarily lives, or who holds primary physical custody, and who typically handles most day-to-day care and routines. The label can carry legal and financial implications that depend on the jurisdiction. In shared-time arrangements the distinction is often less clear-cut or is defined mainly for administrative purposes.

Non-custodial parent

A non-custodial parent is the parent with whom the child does not primarily live, but who usually retains parenting time, an active role in the child's life, and often decision-making rights. "Non-custodial" describes the residential arrangement, not the parent's importance. In shared-custody families the term may not apply neatly, and its legal meaning varies by jurisdiction.

Primary residence

Primary residence is the home where a child spends the majority of overnights, or is considered to live for legal, school-enrollment and administrative purposes. A child may spend meaningful time at both homes yet still have one designated primary residence. Some jurisdictions attach practical consequences to the designation; others focus on the overall parenting-time split instead.

Schedules & time

Parenting time (visitation)

Parenting time, often called visitation, is the scheduled time a child spends in the care of each parent. Many jurisdictions now prefer "parenting time" over "visitation" to reflect that both parents actively parent rather than merely visit. It is set out in the parenting plan and can range from alternating weeks to occasional or supervised time.

Parenting plan

A parenting plan is a written agreement or court order setting out how separated parents will raise their child — covering the custody schedule, holidays, decision-making, exchanges, communication and how disputes are handled. It becomes the reference both households follow. The required contents and how strictly a plan is enforced differ from one jurisdiction to another.

Right of first refusal

Right of first refusal is a parenting-plan provision requiring a parent who needs childcare for a defined period to first offer that time to the other parent before arranging a babysitter or third party. It aims to maximize each parent's time with the child. The trigger, such as how many hours it applies to, varies by agreement and jurisdiction — see our right of first refusal guide.

Alternating weeks

Alternating weeks is a custody schedule in which the child spends one full week with one parent, then the next full week with the other, usually with a single weekly exchange. It suits older children and parents who live close, producing an even 50/50 split with minimal handoffs. Our alternating weeks guide covers the trade-offs.

2-2-3 schedule

A 2-2-3 schedule is a 50/50 rotation in which the child spends two days with one parent, two with the other, then three with the first, before the pattern flips the following week. It keeps children from going long without seeing either parent, which many find helpful for younger kids. See our 2-2-3 schedule guide.

Handoff (exchange)

A handoff, also called an exchange, is the moment a child moves from one parent's care to the other's at the start or end of parenting time. Exchanges can happen at homes, schools or neutral locations. Because they can be tense, many parenting plans specify the time, place and logistics to keep transitions calm and predictable.

Birdnesting

Birdnesting, also called nesting, is an arrangement in which the children stay in one home full-time while the parents take turns living there during their parenting time, rotating in and out. It keeps the children's environment stable, though it requires a second space for the off-duty parent and a high level of cooperation, and is often used temporarily.

Process & support

Parallel parenting

Parallel parenting is a low-contact co-parenting approach for high-conflict situations, in which each parent handles day-to-day decisions during their own time and communication is kept minimal, structured and usually in writing. It reduces friction by limiting direct interaction while both parents stay involved. Our parallel parenting guide explains how to set it up.

Parenting coordinator

A parenting coordinator is a trained neutral professional — often with a legal or mental-health background — appointed to help high-conflict parents implement their parenting plan, resolve day-to-day disputes and improve communication. Depending on the jurisdiction and appointment, a coordinator may make limited recommendations or decisions. Their exact authority and availability vary by location.

Supervised visitation

Supervised visitation is parenting time that takes place in the presence of a designated third party — a professional, an agency or an approved family member — to ensure the child's safety. Courts may order it where there are concerns such as abuse, neglect or substance use. It is often a temporary measure, and the governing rules vary by jurisdiction.

Guardian ad litem

A guardian ad litem (GAL) is a person, often an attorney or trained volunteer, appointed by a court to represent a child's best interests during custody or related proceedings. A GAL may investigate the family situation, speak with the child and others, and report recommendations to the court. The role, powers and even the title vary by jurisdiction.

Child support

Child support is a recurring payment one parent makes to help cover a child's living costs — housing, food, clothing, education and care. Amounts are typically set using formulas that weigh each parent's income and the parenting-time split. Child support is generally handled separately from custody. Calculation methods and enforcement differ substantially by jurisdiction.

Mediation

Mediation is a voluntary or court-referred process in which a neutral mediator helps separated parents negotiate a parenting agreement without deciding the outcome for them. It is usually less adversarial, faster and cheaper than a trial, and most custody matters resolve through negotiation rather than a courtroom. Availability, and whether it is mandatory, vary by jurisdiction.

Frequently asked questions

What is the difference between legal and physical custody?

Legal custody is the authority to make major decisions about a child, such as schooling, medical care and religion. Physical custody is about where the child actually lives and who provides day-to-day care. A parent can share one without sharing the other equally. The precise legal meanings vary by jurisdiction.

Is joint custody the same as 50/50?

Not necessarily. Joint custody means both parents share responsibility — for decision-making, living time, or both — but it does not automatically mean an equal 50/50 split of days. The exact division of time is set by the parenting plan and by local law, so joint custody can involve unequal schedules.

What is birdnesting?

Birdnesting, also called nesting, is an arrangement in which the children stay in one home full-time while the parents take turns living there during their parenting time. It keeps the children's environment stable but requires a second space for the off-duty parent and a high degree of cooperation, and is often used temporarily.