Co-parenting boundaries: a practical list, with examples of what to say

Boundaries in co-parenting are not about controlling the other parent. You cannot make them reply politely, stop sending messages at midnight or keep your new partner out of their conversations. What you can control is how you communicate, when you respond and what you will discuss. Clear co-parenting boundaries make that predictable for both of you, and predictability is what lowers the temperature.

Below is a practical list of co-parenting boundaries grouped by area, each with a one-line example of how to say it. After the list you will find how to set them in writing, how to hold them when they are tested, and what to do when boundaries are not enough. It is general information, not legal advice.

A list of co-parenting boundaries, by area

You do not need all of these. Pick the ones that match the problems you actually have, and start with two or three.

1. Communication channel

The boundary: parenting communication happens in one place, ideally email or a single text thread, not across calls, social media and messages through relatives.

2. Contact hours

The boundary: non-urgent messages are read and answered within set hours. Urgent means the children’s health or safety, or a same-day change to a handover.

3. Topics: the children only

The boundary: you discuss the children’s needs, schedule and wellbeing. You do not discuss the relationship, the past, each other’s lives or who was to blame.

4. Response times

The boundary: you reply to non-urgent messages within a reasonable, stated time, and you do not reply instantly just because the other parent expects it.

5. Handovers

The boundary: handovers are short, on time and in a set place. Disagreements are not raised in front of the children.

If handovers are tense, a neutral place such as a school, a café or a supervised changeover service can help.

6. New partners

The boundary: each parent decides who is in their own home and their own life. New partners are introduced to the children thoughtfully and are not a topic for argument or a go-between for messages.

Co-parenting boundaries while in a new relationship work both ways. Your new partner should not message, criticise or negotiate with the other parent on your behalf, and you should not expect them to. If the other parent has a new partner, the same applies in reverse. You can ask to be told when someone will be a regular presence in the children’s lives, but you do not get a veto over their relationship.

7. Money

The boundary: shared costs are raised in writing, with a receipt, and paid in an agreed way. Child support is handled through the agreed or formal channel, not argued about in parenting messages.

8. Social media

The boundary: neither parent posts about the other, the separation or the conflict. You agree whether, and how, photos of the children are shared.

9. The children as messengers

The boundary: adults pass messages to adults. The children are not asked to carry information, report on the other home or deliver complaints.

10. Decisions and schedule changes

The boundary: changes to the schedule are requested in writing with reasonable notice, and only become changes once both parents have agreed. Major decisions about schooling or health are discussed before they are made.

How to set boundaries in writing

Say it once, clearly, in a calm message. You are not asking permission and you are not opening a debate. You are telling the other parent how you will communicate from now on.

Keep it short, avoid blame and do not list everything they have done wrong. Then save a copy. If you later need to show a mediator or court how you tried to keep communication workable, a calm message like this helps.

How to hold a boundary when the other parent pushes back

Expect the boundary to be tested. A message at 11pm, a sarcastic reply, an attempt to reopen an old argument. How you respond in the first few weeks decides whether the boundary sticks. If testing boundaries is a constant pattern, our guide to co-parenting with a narcissist may help.

• Act on it, don’t defend it. If you said you reply between 8am and 7pm, reply at 8am. You do not need to explain why.
• Repeat calmly. If they challenge it, restate it once in the same words: “As I said, I’ll reply to non-urgent messages within 24 hours.” Then move on. If they respond by casting you as the problem, that pattern is called DARVO.
• Don’t argue about the boundary itself. Each justification gives them something new to dispute. The boundary is not up for negotiation; the parenting issues are. Our guide on how to respond to a narcissist has example replies for this.
• Answer the practical point only. A BIFF reply (brief, informative, friendly, firm) keeps you on the facts.
• Give less to react to. With a parent who feeds on conflict, the grey rock method of short, neutral, unemotional replies can reduce the bait. If coldness could be held against you, the warmer yellow rock method works the same way.

Our guide to co-parenting communication has more on the everyday side of this.

Boundaries in high-conflict co-parenting

In a high-conflict situation, the boundaries above need to be tighter and more structured. Fewer channels, fewer topics, fewer opportunities to argue.

• Written only. No phone calls except emergencies. Everything in one place, in writing.
• Scheduled replies. Check messages once a day at a set time, rather than reacting as they arrive.
• Handovers at a neutral or supervised location, or through school pick-up and drop-off so you do not meet.
• Keep a record of messages and incidents in date order.

Where cooperation is not realistic at all, parallel parenting may suit you better. Each parent runs their own home their own way, contact between you is kept to the minimum needed, and the boundaries become the structure rather than something you keep negotiating.

When boundaries are not enough

Boundaries rely on both parents mostly respecting them. When they are ignored over and over, it may be time for something more formal.

• A parenting plan: a written agreement you both sign about the arrangements for your children. You can include communication rules, handover details and how schedule changes are made. A parenting plan is not legally enforceable, but it sets clear expectations.
• Consent orders: if you agree but want it to be enforceable, one option is to apply to the Federal Circuit and Family Court of Australia for consent orders. You usually do not need to go to court for them.
• Family dispute resolution (FDR): mediation with a registered practitioner. In most cases, separating parents are expected to attempt FDR and get a certificate from the practitioner before applying to the court for parenting orders. There are exceptions, including urgency and family violence. The Family Relationship Advice Line on 1800 050 321 can point you to services.
• Legal advice: a family lawyer, Legal Aid or a community legal centre can advise on your situation.

In the US, the same ideas apply to custody and parenting-time arrangements, often set out in a parenting plan or custody order. Family law is mostly state law, so the rules vary by state. A family law attorney or free legal aid (LawHelp.org) can explain how it works where you live.

Make your boundaries easier to keep

The hardest boundaries to hold are the ones you have to read your way through: the late-night message, the dig hidden inside a question about pick-up. FenceChat helps by filtering hostility out of what you read, so you can answer the practical point at a time you choose. Your contact hours, your one channel and your “children only” rule are easier to keep when less of the bait reaches you.

FenceChat gives you a separate email address and, on the Protected and Legal plans, a separate mobile number to give the other parent instead of your own. Their messages are filtered before they reach you: the practical information comes through and hostile language is filtered out. The untouched original is kept in your Archive, timestamped, in case you ever need it. They do not need an app or an account, and you never have to share your real number or address.

If you feel unsafe

Boundaries are for difficult co-parenting, not for abuse. If the other parent threatens you or the children, or you are afraid of them, get help.

• In an emergency, call 000 in Australia or 911 in the US.
• For confidential support about family and domestic violence, call 1800RESPECT on 1800 737 732 in Australia, or the National Domestic Violence Hotline on 1-800-799-7233 (text START to 88788) in the US.

See Where to get help for services in Australia, the US and the UK.