Glossary
The co-parenting glossary: custody and parenting terms, defined.
Custody paperwork and parenting plans are full of terms that sound interchangeable but mean specific things, and getting them mixed up can change what you agree to. This glossary defines the words that come up most, in plain language, with the distinctions that actually matter. Start with the quick reference below, then open any term for the full explanation and how it plays out day to day.
Quick reference
Every term in this glossary with a one-line definition. Open any term for the full entry, including how it interacts with the others and what it means in practice.
| Term | Definition |
|---|---|
| Co-parenting | Shared raising of children by two parents who are no longer together. |
| Parallel parenting | Low-contact model where each parent runs their own household by written rules. |
| Co-parenting vs parallel parenting | Two operating models, one assumes cooperation, the other assumes none. |
| Joint custody | Umbrella term for shared parental rights and responsibilities. |
| Joint legal custody | Both parents share decision-making over schooling, medical care, and religion. |
| Joint physical custody | Both parents have substantial overnight time with the child. |
| Sole custody | Legal or physical authority concentrated in one parent. |
| Custodial parent | The parent the child lives with most of the time. |
| Parenting plan | The written agreement that defines schedule, decisions, and rules. |
| Parenting time percentage | Each parent's share of overnights, calculated across the year. |
| Visitation vs parenting time | The older legal term and its modern replacement. |
| Exchange and handoff | The transition moment when the child moves between parents. |
| Right of first refusal | Offer the other parent extra time before using a sitter. |
| Nesting arrangement | Children stay in one home; parents rotate in and out. |
| Step-parent role | A new partner with daily involvement but no default legal rights. |
How the terms fit together
Most of these terms slot into one of three layers. The first is the overall approach, whether you are co-parenting cooperatively or parallel parenting at arm's length. The second is custody itself, which always splits two ways: legal custody is decision-making, physical custody is overnights, and each can be joint or sole independently of the other. The third layer is the practical mechanics, the parenting plan that writes it all down, the parenting time percentage that quantifies the split, and the day-to-day pieces like exchanges, the right of first refusal, nesting, and the step-parent's role. Read across the three layers and the vocabulary stops feeling like jargon and starts describing one coherent arrangement.
All fifteen terms
Each entry gives the full definition, the distinctions that trip people up, and how the term shows up in a real parenting plan.
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Co-parenting
The shared raising of children by two parents who are no longer in a romantic relationship, with both parents holding ongoing parenting time, decision-making input, and a working communication channel.
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Parallel parenting
A structured approach in which separated parents minimize direct contact and each runs their own household independently, with detailed written rules governing every interaction.
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Co-parenting vs parallel parenting
Two operating models for raising children after separation. Co-parenting assumes the parents can cooperate; parallel parenting assumes they cannot, and structures the arrangement accordingly.
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Joint custody
The umbrella term covering shared parental rights and responsibilities, divided into joint legal custody for decision-making and joint physical custody for overnights. The two often coexist but operate independently.
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Joint legal custody
Both parents share equal decision-making authority over major issues in a child's life, schooling, medical care, religion, and mental health, regardless of where the child lives.
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Joint physical custody
Both parents have substantial overnight time with the child, typically at least one-third of nights in a calendar year, though the exact threshold varies by state.
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Sole custody
Legal or physical authority concentrated in one parent. Sole legal custody gives one parent all major decision-making power; sole physical custody gives one parent the overwhelming majority of overnights.
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Custodial parent
The parent with whom a child lives most of the time, who holds primary physical responsibility and typically claims the child for tax and benefit purposes.
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Parenting plan
The written agreement between separated parents that defines the custody schedule, decision-making authority, holiday rotations, communication rules, and dispute resolution process.
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Parenting time percentage
The share of overnights each parent has with the child, calculated annually and used to determine child support, tax dependency, and joint custody thresholds.
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Visitation vs parenting time
Visitation is the older legal term for time a non-custodial parent spends with the child. Parenting time is the modern replacement, used in most states since the early 2010s, and reflects equal parental status.
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Exchange and handoff
The transition moment when the child moves from one parent's care to the other. The location, timing, and routine of exchanges shape whether the schedule feels smooth or constantly tense.
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Right of first refusal
A parenting plan clause that requires one parent to offer the other extra parenting time before using a babysitter, day care, or relative.
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Nesting arrangement
Also called bird's nest custody, a setup where the children stay in one family home and the parents rotate in and out on a schedule, often during the transition period after separation.
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Step-parent role
A step-parent is the new partner of a biological parent. They hold no legal custody rights by default, but play a daily role that calls for its own working relationship with the other biological parent.
Co-parenting terms FAQ
What is the difference between legal custody and physical custody?
Legal custody is the authority to make major decisions about a child, schooling, medical care, religion, and mental health. Physical custody is about where the child lives and who has them overnight. The two are decided separately, so a parent can hold one without the other. A common arrangement is joint legal custody, where both parents share decision-making, combined with a physical custody split that may or may not be equal.
What is the difference between co-parenting and parallel parenting?
Co-parenting assumes the parents can communicate and make joint decisions cooperatively, so the two households stay coordinated. Parallel parenting assumes they cannot cooperate without conflict, so it minimizes direct contact and lets each parent run their own household independently under detailed written rules. Many families begin with parallel parenting during a high-conflict period and move toward co-parenting as tension eases.
What is a parenting plan?
A parenting plan is the written agreement between separated parents that defines how they will raise their children. It sets out the custody schedule, who holds decision-making authority over major issues, how holidays and school breaks rotate, the communication rules between parents, and the process for resolving disputes. It is the reference both parents return to whenever a question comes up.
What does parenting time percentage mean?
Parenting time percentage is each parent's share of overnights with the child, calculated across a full year. It matters beyond scheduling: many states use it to help determine child support, to decide which parent claims the child for tax purposes, and to test whether an arrangement crosses the threshold for joint physical custody. Because it is counted by overnights rather than daytime hours, the percentage can differ from how the week feels.
Have the terms down? Put them to work → compare custody schedules
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