BIFF Response Examples for Co-Parenting: Calm Replies to Hostile Texts

You know what you want to say. You also know exactly how it would be used against you. There's a way to answer that keeps the peace and keeps your dignity.

If you're searching for BIFF response examples for co-parenting, you probably already know the theory. Keep it short, keep it neutral. The hard part is what happens when the message actually lands: your heart is pounding, your thumbs are already typing, and the reply you're drafting is three paragraphs long and full of everything you've been holding in for years. What you need in that moment isn't a definition. It's a model you can copy.

The BIFF method was developed by Bill Eddy, an attorney, therapist, and co-founder of the High Conflict Institute, as a way to respond to hostile messages from high-conflict people. It's widely used by family law professionals and co-parenting counselors, and you don't need your ex to have any diagnosis to use it. Whether you're dealing with narcissistic traits or simply someone who turns every message into a fight, BIFF works the same way: it gives the conflict nothing to feed on.

What does BIFF stand for?

Each letter is a small check you can run on your reply before you hit send.

• Brief: A few sentences, usually one short paragraph. The longer the reply, the more there is to pick apart.
• Informative: Straight, useful facts about the kids or the plan. No opinions, no defending, no history lessons.
• Friendly: A small courtesy, like "Thanks for letting me know" or "Have a good weekend." Not warm, not gushing. Just civil.
• Firm: It ends the topic. You state what's happening or offer a clear choice, and you don't leave the door open to another round.

Of the four, "friendly" is the one most parents resist. When someone has just called you a terrible mother, a "thanks" can feel like swallowing glass. But that small courtesy isn't for them. It's for the record, and for you. A judge or mediator reading the thread later sees one parent hurling accusations and another calmly talking about pickup times. That contrast speaks louder than any defense you could write.

You're not writing to win the argument. You're writing so there isn't one.

BIFF response examples for the messages co-parents get most

These are composites of messages parents tell me they receive over and over. Read the reply, then read why it works, because once you understand the pattern you'll be able to write your own.

When the message is a personal attack

When they change the schedule at the last minute

When it's a guilt trip about the kids

When they threaten court

When the message is pure venting with no question

Sometimes the most BIFF thing you can do is nothing at all. If a message contains no question, no request, and no information about the children, it may not need a reply. Screenshot it, save it, and close the app. A mom I'll call Renee (a composite of several parents who've written to me) used to answer every one of those late-night rants because silence felt rude. When she stopped, she noticed the rants got shorter. Not right away, but over a couple of months, as they stopped getting a reaction.

What should you leave out of a BIFF response?

When I was in the thick of it, my first drafts were full of the things on this list. That's normal. Write the angry version if you need to, somewhere your ex will never see it. Then cut it down. A good BIFF reply leaves out four things almost every time: advice ("Maybe if you planned ahead…"), admonishments ("You need to stop…"), apologies you don't mean just to make it stop, and sarcasm, which reads very differently to a judge than it does in your head.

It also leaves out your defense. This is the hardest one. When someone rewrites history, every part of you wants to correct the record. But explaining yourself to a person who isn't listening rarely changes their mind, and it gives them a fresh paragraph to argue with. Your actual record, the calm messages and documented facts, does the defending for you. If you're keeping a log, my guide on how to document a narcissist co-parent shows you what to save and how.

How do you write a BIFF response when you're furious?

Here's the routine I suggest to parents who freeze or flood when a message comes in. It takes a few minutes, and it gets easier every time.

1. Wait. Unless it's about safety or something happening in the next hour, give yourself time. Thirty minutes, or until morning.
2. Find the real question. Highlight the one part that's actually about the kids or the plan. Everything else is noise.
3. Draft the answer in one or two sentences. Facts only. A time, a place, a yes or no.
4. Add a small courtesy. "Thanks for letting me know" at the start or "Have a good weekend" at the end.
5. Close the loop. End with a clear statement or a simple choice, not a question that invites debate.
6. Reread it as a judge would. Would a stranger see a calm, cooperative parent? If yes, send it.

A dad I'll call Owen told me he keeps a note on his phone titled "BIFF it" with these steps written out. When his ex's name pops up, he opens the note before he opens the message. "It's like putting on a seatbelt," he said. "I don't feel calm, but I act calm, and the thread looks calm, and that's what counts."

If you'd like the Playbook together with my documentation planner and kids' guide, the Digital Crisis Kit bundles them in one download.

Is BIFF the same as gray rock?

They're close cousins, and many parents use them together. Gray rock is a broader approach: becoming as uninteresting as possible to someone who feeds on your reactions, in texts and in person. BIFF is a specific recipe for writing a reply. The main difference is the "friendly" part. Gray rock can be very flat; BIFF deliberately adds a little courtesy, which tends to look better in a co-parenting record. If you're also struggling with when and whether to reply at all, my article on how to respond to a narcissist ex's texts covers that piece.

When isn't a BIFF response enough?

BIFF is a communication tool. It isn't protection. If messages include threats of harm, stalking, or anything that makes you afraid for yourself or your children, a well-worded reply is not the answer. Save everything, don't engage with the threat, and reach out for real help.

For everything short of that, BIFF is one of the kindest things you can do for yourself. Renee put it this way a few months in: "I used to spend whole evenings on one text. Now it takes me five minutes, and I get my night back." That's what I want for you.

So tonight, pull up the last message that knocked the wind out of you. Find the one real question in it. Write a BIFF reply, even if you never send it. You'll see how much lighter it is than the reply you've been carrying around in your head.

Frequently asked questions

Isabella Francis writes about co-parenting with high-conflict and narcissistic exes. This article is for education and support, not a substitute for legal or mental-health advice.