This is part of our comprehensive guide: The Complete Guide to High-Conflict Co-Parenting
You just got a message from your co-parent that made your blood pressure spike. It is accusatory, dramatic, maybe threatening. Every cell in your body wants to fire back and set the record straight.
Do not.
The BIFF method, developed by Bill Eddy at the High Conflict Institute, gives you a simple framework for responding to high-conflict messages in a way that de-escalates the situation, protects your case, and keeps the focus on your children. It is one of the most practical tools in co-parenting communication, and once you learn it, you will use it every single day.
1. What Is BIFF?
BIFF stands for Brief, Informative, Friendly, and Firm. It is a filter you run every outgoing message through before you send it.
Brief
Keep it short. A few sentences at most. Long messages invite point-by-point rebuttals and give the other person more material to twist. If your reply is longer than their message, you are probably over-explaining.
Informative
Stick to facts and logistics. No opinions. No feelings. No interpretations of their behavior. Just the information that is relevant to the children or the schedule.
Friendly
Not fake. Not sarcastic. Just civil. A brief "Thank you for letting me know" or "I appreciate you reaching out" goes a long way. Think of the tone you would use with a coworker you do not particularly like.
Firm
End the conversation. Do not leave the door open for a back-and-forth debate. "I have noted this" or "Let me know if the schedule needs adjusting" signals that you are done. No further discussion needed.
The key insight: BIFF is not about being nice. It is about being strategic. Every message you send is a potential court exhibit. BIFF makes sure your exhibits help you.
2. The Anatomy of a BIFF Response
Before you hit send on any message, run it through this checklist.
The BIFF Checklist
Is it brief? Can I say this in fewer words? Could I cut a sentence?
Is it informative? Am I sharing facts, or am I defending myself? Am I reacting to emotions?
Is it friendly? Would this sound reasonable if a judge read it? Would a stranger think I was being civil?
Is it firm? Does this close the loop, or does it invite another round of argument?
The 24-Hour Draft Rule
For emails, type your first draft. Then close it. Come back the next day and rewrite it using BIFF. Your first draft is for you. Your second draft is for the court. This one practice will prevent more regrettable messages than any other advice in this guide.
3. Before and After Examples
The best way to learn BIFF is to see it in action. Here are real-world scenarios with the hostile version you want to send, and the BIFF version you should send.
Scenario: Schedule change demand
Their Message
"I need the kids this Friday instead of Saturday. My mom is in town and she wants to see them. You need to make this work."
Hostile Response
"You can't just demand schedule changes whenever it's convenient for you. The order says Saturday. Maybe if you planned ahead for once instead of springing things on me last minute this wouldn't be an issue. No."
BIFF Response
"Thanks for letting me know your mom is visiting. Friday does not work this week because the kids have plans. I am happy to keep Saturday as scheduled so they can see her then. Let me know."
Why it works: Brief - three sentences. Informative - explains the conflict without blaming. Friendly - offers an alternative. Firm - does not leave the decision open for debate.
Scenario: Blame and accusations
Their Message
"The kids came home without their jackets AGAIN. You clearly don't care about their well-being. I'm keeping track of every time you do this and bringing it to court."
Hostile Response
"They left them in YOUR car last weekend and I didn't say anything because I'm not petty. But sure, go ahead and tell the judge about jackets. I'm sure that will go great for you."
BIFF Response
"I will make sure the jackets are in their bags for the next exchange. Thanks for letting me know."
Why it works: Addresses the actual issue (jackets) without engaging with the insults, the threats, or the scorekeeping. A judge reading this sees a reasonable parent solving a problem.
Scenario: Medical decision disagreement
Their Message
"I just found out you took Emma to the doctor without telling me. That's MY child too and I have JOINT LEGAL CUSTODY. I'm calling my lawyer first thing Monday."
Hostile Response
"She had a 103 fever. What was I supposed to do, wait 3 days until your weekend to get your permission? Maybe if you answered your phone once in a while you'd know what was going on. Call whoever you want."
BIFF Response
"I understand your concern. Emma had a fever of 103 on Wednesday and I brought her to Dr. Patel for a same-day appointment. I should have texted you sooner and I apologize for that. She was diagnosed with an ear infection and prescribed amoxicillin for 10 days. I can share the visit summary if that would be helpful."
Why it works: Acknowledges their concern. Provides complete information. Takes appropriate responsibility. Offers to share documentation. Ignores the threat. This is the kind of message that makes a judge think you are the reasonable one.
Scenario: Pure provocation
Their Message
"Everyone warned me about you. My lawyer says I have a slam dunk case. Enjoy your time with the kids while it lasts."
Hostile Response
[Anything you type right now]
BIFF Response
[No response needed. There is no question, no logistics, no child-related information. Save the screenshot. Move on.]
Why it works: Sometimes the most powerful BIFF response is no response. Not every message deserves your time or energy. Save it, log it, and let their words speak for themselves.
4. BIFF for Text Messages
Texting feels casual. That is what makes it dangerous. You type fast, you skip the filter, and suddenly there is a permanent record of something you wish you had not said. Here is how to apply BIFF to texts.
Set a response delay
Turn off read receipts. Mute the conversation if you need to. Give yourself at least 15 to 30 minutes before responding. The emotional charge fades fast once you stop staring at the screen.
Type in your notes app first
Draft your response somewhere else. Read it. Ask yourself: is this Brief, Informative, Friendly, and Firm? Edit it. Then paste it into the text thread. This ten-second habit prevents most regrettable messages.
One topic per text
Do not let texts spiral into multi-topic arguments. If they bring up three different things in one message, respond only to the one that is logistically relevant. If they want to discuss the others, suggest email where you can address each point separately.
Move complex discussions to email
Texts are for quick logistics: "Running 10 minutes late." "She needs her allergy medicine at 4." For anything more complicated, say: "This might be easier to sort out over email. I will send you a message tonight." This buys you time and a better format.
5. BIFF for Email
Email is where BIFF really shines. You have time. You have space. And if you do it right, your email archive becomes one of the strongest pieces of evidence in your case.
The BIFF Email Template
Structure Every Email Like This
Line 1: Friendly acknowledgment
"Thank you for your email." or "I appreciate you bringing this up."
Lines 2-3: The information
Address only what is logistically necessary. Provide facts, dates, and specifics about the children.
Last line: Firm close
"Let me know if you have questions about the schedule." or "I am happy to discuss this further if needed."
What to Leave Out
Remove These
- Defending past decisions
- Correcting their version of events
- Sarcasm or passive aggression
- Threats about court or lawyers
- Anything about the relationship
Keep These
- Dates and times
- Children's needs and activities
- Schedule confirmations
- Medical or school updates
- Proposed solutions
6. BIFF for Parenting App Messages
If you are using a co-parenting app like OurFamilyWizard, TalkingParents, or AppClose, you already have one advantage: everything is automatically logged and timestamped. The court can pull the full history. This is both helpful and unforgiving.
The golden rule of parenting apps: Write every message as if a judge is reading it over your shoulder. Because they might be.
App-Specific Tips
Use the built-in tools
Most co-parenting apps have expense tracking, calendar sharing, and file sharing features. Use them. When a disagreement comes up about who paid for what or when something was scheduled, the app has the receipts. This reduces the need for contentious back-and-forth messages.
Do not use the app to vent
The co-parenting app is not a place to express your feelings about the other parent. Every message is part of the court record. Save your venting for your therapist, your support group, or a trusted friend.
Keep parallel conversations out
If the other parent texts or calls you outside the app, redirect them: "I would prefer to keep our communication in the app so we both have a clear record. I will respond to your message there." This protects you and maintains the documentation trail.
7. When BIFF Is Not Enough
BIFF is a powerful tool. But it has limits. There are situations where polite, structured responses will not solve the problem because the problem is not about communication style.
When there are safety concerns
If you or your children are in danger, BIFF is not the answer. Contact local law enforcement. Call the National Domestic Violence Hotline at 1-800-799-7233. Talk to your attorney about emergency custody motions. Your safety comes first.
When they are violating court orders
If the other parent is consistently violating the custody order, BIFF messages alone will not fix that. Document every violation. Save every exchange where you politely reminded them of the order and they ignored it. Then talk to your attorney about enforcement options.
When you need to set boundaries, not just communicate
BIFF handles individual messages. But if the overall pattern is harassment, constant boundary violations, or parental alienation, you need a broader strategy. That might include requesting communication through attorneys only, modifying the parenting plan, or seeking a court order limiting contact methods.
When you are struggling to do it on your own
There is no shame in this. If you find yourself breaking BIFF consistently, or if the emotional toll of high-conflict communication is affecting your daily life, talk to a therapist who specializes in high-conflict co-parenting. Having someone in your corner who understands the dynamics makes a real difference.
8. How to Document Your BIFF Communications
Every BIFF response you send is a piece of evidence. But evidence only works if it is organized and accessible. A scattered collection of screenshots buried in your camera roll is not going to help you in court.
What to Document
- The full conversation thread. Not just their bad messages. The whole thing. Your BIFF responses in context are what show the contrast.
- Timestamps on everything. When was the message sent? When did you respond? How long did they wait before the next hostile message? Timing tells a story.
- Messages you chose not to respond to. Save them anyway. The pattern of unanswered provocations followed by your calm, logistical responses is powerful.
- Your notes about what happened around the messages. "Received this after I declined the schedule change. Kids were with me. No safety issue. I did not respond."
How to Organize It
At minimum, you need a system that stores communications by date, categorizes them by type (text, email, app), and lets you add context notes. A spreadsheet can work in a pinch, but it gets unwieldy fast. A dedicated documentation tool like Evidexi is designed for exactly this: upload the evidence, tag it, add your notes, and have it all organized on a timeline when you need it.
Here is the thing about BIFF: It builds a court record automatically. Every time you respond with a Brief, Informative, Friendly, and Firm message, and they respond with hostility, accusations, or threats, the contrast is obvious. You do not have to explain it to a judge. They can read it.
9. Next Steps
Start with one message. The next time you get a text that makes you want to react, write your natural response in a note, then rewrite it as BIFF. Compare the two. Notice the difference. That is the message the court will see.
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