How do I respond to a high conflict ex?

Answer only the practical part of the message, in a few sentences, with a friendly opening and a clear position. Leave insults and accusations unanswered. If the message has no practical question in it, you often do not need to reply at all.

How long should a reply to a hostile message be?

Short. Aim for under 80 words for most replies. The more you write, the more there is to argue with, and a short reply signals that you are not entering a debate.

Should I apologize to keep the peace?

Only for something you actually did. Apologizing for things you did not do, to calm someone down, can be quoted back to you later as if you accepted blame. Thanking them for the information is usually a better opener.

What if they reply again with more insults?

If you have already answered the practical question, you do not need to reply again. If you must, keep it even shorter and repeat your key information in the same words.

Does the builder use AI?

No. It is rule-based. It fills a reply template from your answers and checks your draft against a list of words and patterns that tend to escalate conflict, such as absolutes, sarcasm, name-calling and threats.

How to Respond to a High Conflict Ex: Calm Reply Builder

When a hostile message arrives, the reply that works best is usually the shortest one you can write: answer the practical question, leave the insults alone, and say clearly what happens next. Pick the situation below, fill in a few facts, and the builder drafts a calm reply. Then paste in your own draft and it will flag words that tend to make things worse.

The builder is rule-based, not AI. It fills a template from your answers and checks wording against a list of patterns, so read the result and adjust it to your situation before you send anything.

Why short, factual, friendly and firm replies work

The structure the builder uses follows the BIFF Response® method by Bill Eddy, High Conflict Institute. BIFF stands for Brief, Informative, Friendly and Firm, and the method was written for exactly this: hostile emails and texts in divorces and other disputes.

Brief. Eddy's point is that the more you write, the more material the other person has to criticize. A short reply also signals you are not opening a debate.
Informative. Give accurate, useful facts. Focus on the accurate statements you want to make, not on rebutting each inaccurate one.
Friendly. A brief friendly greeting or closing lowers the temperature. It does not mean warm or apologetic, just relaxed and non-antagonistic.
Firm. State your position or the next step and close the topic. Avoid lines that invite more argument, such as "I hope you'll agree that..."

Eddy also stresses something parents often find hard to accept: much hostile communication does not need a response at all. More on that below.

There is a second reason to keep replies calm, and it is about your children. Research reviewed for the UK Department for Work and Pensions found that frequent, intense and poorly resolved conflict between parents is what puts children's mental health at risk. Every exchange that ends quickly is one less round of conflict in their lives.

8 co-parenting text message examples, before and after

Each example shows the incoming message, a typical reactive reply, and a calmer version. Names and details are invented.

1. Schedule change

Their message: "I'm taking the kids this weekend. My mom's in town. Deal with it."

Reactive reply: "You can't just take them whenever you feel like it. This is MY weekend and you know it. Typical."

Calm reply: "Hi Sam, thanks for letting me know your mom is visiting. This weekend is my time and I have plans, so I'll keep the schedule as it is. If you'd like her to see the kids, I can bring them over Sunday from 2 to 4. Please let me know by Thursday."

Why it works: it acknowledges the reason, holds the schedule, and offers one concrete alternative with a deadline.

2. Late pickup

Their message: "Traffic. I'll get there when I get there."

Reactive reply: "You're ALWAYS late. The kids have been waiting at the window for an hour. Do you even care?"

Calm reply: "Hi Sam, thanks for the message. Handover is at 6:00. I'll wait until 6:20. After that I'll take the kids home, and you can collect them there by 7:30. Please message me when you're 10 minutes away."

Why it works: no lecture, just the agreed time, how long you will wait, and what happens next. If lateness is a pattern, keep a dated note of each instance separately rather than listing them in the reply.

3. Money and reimbursement

Their message: "I'm not paying half of that ridiculous dentist bill. You never even asked me."

Reactive reply: "Ridiculous? It's your daughter's teeth. Maybe if you paid for anything ever I wouldn't have to chase you."

Calm reply: "Hi Sam, Mia's dentist visit on 3 November was $180, so your share is $90. The receipt and the dentist's note are attached. Please send it by 30 November by bank transfer. If you'd like to agree how we approve costs like this in future, I'm open to that."

Why it works: it gives the facts and the documents, ignores "ridiculous", and answers the real complaint, being asked first, with a forward-looking offer rather than a defense.

4. Insults

Their message: "You're a pathetic excuse for a parent. The kids hate being at your place."

Reactive reply: "At least I'm there for them. Ask them yourself who actually shows up."

Calm reply: "Hi Sam, I've read your message. The kids will be ready at school on Friday at 3:15. I'll keep our messages to the children's arrangements."

Why it works: there is nothing practical to answer except the next handover, so that is all the reply contains. Often the better option is not to reply at all.

5. New partner

Their message: "I don't want that man anywhere near my children. Who even is he?"

Reactive reply: "He's a better role model than you've ever been. You don't get a say in my life anymore."

Calm reply: "Hi Sam, I understand you have concerns about Alex being around the kids. He has met them twice, and I've been there each time. You're welcome to meet him briefly at a handover. Beyond that, I'll keep our messages to the children's arrangements."

Why it works: it treats the concern as real, gives two facts, offers something, and closes the topic. If your custody order or parenting plan says anything about new partners, follow it.

6. School decision

Their message: "I've enrolled Mia at Lincoln. It's done, so don't bother arguing."

Reactive reply: "You had no right. I'll be calling the school tomorrow to undo this."

Calm reply: "Hi Sam, thanks for telling me about the Lincoln enrollment. Our plan says we choose schools together, so I haven't agreed yet. Before I decide, I'd like to visit the school and see the enrollment details. I'll reply by 20 November."

Why it works: it states the agreed process without accusing, asks for what you need, and commits to a date. Check what your custody order or parenting plan actually says about school decisions before relying on it.

7. Holiday plans

Their message: "I'm taking the kids to Florida for Christmas. You can see them when we're back."

Reactive reply: "Absolutely not. You don't get to steal Christmas because you booked flights without asking."

Calm reply: "Hi Sam, thanks for sharing your travel plans. Under our schedule, December 24 to 26 is my time this year. You're welcome to travel on your dates, December 27 to January 2. Please send the flight times and where you'll be staying by 1 December."

Why it works: it separates the trip, which can work, from the dates, which are set, and asks for the details you would want for any travel.

8. Threats to go to court

Their message: "Keep this up and I'll see you in court. My lawyer will bury you."

Reactive reply: "Go ahead. My lawyer is better than yours, and the judge will see exactly what you are."

Calm reply: "Hi Sam, I've read your message. I'd prefer to sort out the summer schedule between us or with a mediator, and I'm willing to book a session. If you decide to involve lawyers, please have them contact me in writing at this address. In the meantime, the current arrangements stay as they are."

Why it works: it does not take the bait, offers a calmer route, and makes clear the existing arrangement continues. If you receive actual court papers, or a threat to take the children, talk to a family lawyer. This page is general information, not legal advice.

What not to write

The builder's word check flags these patterns. They feel satisfying to type and almost always make the next message worse.

Avoid	Why	Try instead
"You always..." / "You never..."	Invites a counter-example and an argument	A specific date: "On 3 and 10 November..."
"As usual," "typical," "obviously"	Reads as a dig at their character	Leave it out
"Ridiculous," "pathetic," "unbelievable"	Judges them instead of answering	"That doesn't work for me."
Name-calling, including "narcissist" or "crazy"	Escalates, and reflects on you if others read it	Describe the behavior, or say nothing
Sarcasm: "Oh great," "Thanks a lot," "Good for you"	Easily misread, rarely de-escalates	Say plainly what you mean
Threats: "or else," "see you in court," "my lawyer"	Raises the stakes of a routine message	State the next step: "Otherwise, the schedule stays as agreed."
ALL CAPS, or doubled question and exclamation marks	Reads as shouting	Normal sentence case, one punctuation mark
"Sorry" for things you didn't do	Can be quoted later as an admission	"Thanks for letting me know."
"The kids told me..."	Puts the children in the middle	Raise the issue directly
Comments about their partner, money or past	Not about the children's arrangements	Answer only the practical question
Long explanations and self-defense	More material to argue with	Two to five sentences

Two more habits to avoid: replying within minutes while you are angry, and copying in friends or relatives. Wait until you are calm, and keep the exchange between the two of you, or with a mediator or lawyer if one is involved.

When not to reply at all

You do not owe a reply to every message. Eddy's guidance is that most hostile messages are venting and have no power unless you give them some, and that answering with similar emotion only produces the next hostile message.

You can usually leave a message unanswered when:

it contains only insults, accusations or complaints about the past
it comments on your private life, partner or home
it repeats a topic you have already answered; if you must reply again, repeat your earlier answer in fewer words
it arrives late at night and nothing needs deciding before morning; reply in your normal time window

You should reply, briefly, when the message:

asks a practical question about the children's schedule, health, school or activities
proposes a change you need to accept or decline
concerns money owed either way
makes an inaccurate claim that is being shared with other people, such as a mediator or family; correct it with a short statement of fact
raises a safety concern about a child

If messages include threats to your safety or the children's, or you are afraid of your co-parent, a calm reply is not the priority. Contact emergency services if you are in danger, and talk to a domestic abuse service or family lawyer about your options. Choosing to answer only the logistics can help in a difficult co-parenting relationship, but Cleveland Clinic notes that suddenly changing how you respond can carry risk in an abusive one.

Calm Replies to a Hostile Co-Parent Message: Builder and Examples

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