Your ex just sent you a three-paragraph text about how you’re “always” late, “never” communicate properly, and are “clearly” trying to alienate the kids. Your fingers are ready to write a novel in response explaining every single thing they got wrong.
Don’t.
The BIFF method exists for exactly this moment. It’s designed to end the back-and-forth that high-conflict communicators thrive on. Here’s how it works and why it might save your sanity (and help your custody case).
What BIFF Actually Means
BIFF stands for Brief, Informative, Friendly, Firm. It was developed by Bill Eddy, a family law attorney and therapist who specializes in high-conflict personalities. The method is specifically designed for written communication with someone who baits you into arguments.
Brief: Keep it short. One paragraph, maybe two. No long explanations or justifications.
Informative: Stick to facts and logistics. Answer questions directly without editorial commentary.
Friendly: Use a neutral to warm tone. Not fake-nice, just professional and respectful.
Firm: End the conversation. Don’t leave hooks for them to respond to. Don’t ask unnecessary questions.
The entire point is to give them nothing to grab onto. No emotional content to twist. No defensive explanations to argue with. Just the information they actually need.
Why BIFF Works (The Psychology)
High-conflict communicators need fuel. They get it from your emotional reactions, your defensive explanations, your counter-accusations. Every time you engage with their bait, you’re feeding the pattern.
BIFF starves the pattern.
When you respond with pure logistics and zero emotional content, you’re not giving them what they want. At first, they may escalate (more texts, more accusations, more attempts to provoke). But if you stay consistent, the pattern loses power.
This isn’t about being nice to someone who doesn’t deserve it. This is about protecting yourself and creating a communication record that helps you in court. Judges can instantly spot the difference between someone using BIFF and someone writing emotional novels.
The Four Elements Broken Down
Brief
One paragraph. Two if you absolutely must. Three sentences is often enough.
Why it matters: The longer your message, the more opportunities you give them to find something to fight about. Length also signals that you’re emotionally invested in defending yourself. Don’t be.
Bad example (too long): “I can’t believe you’re accusing me of being late when you were literally 45 minutes late just last week and I didn’t say anything about it. I have been on time for every single pickup except for two times when there was traffic and I texted you. You never text me when you’re running late. And by the way, I’m not trying to alienate the kids, I’m trying to give them stability which is more than I can say for your house where there are no rules.”
BIFF example: “I’ll be there at 5pm as scheduled. See you then.”
Informative
Answer the actual question. Provide the necessary information. Nothing more.
Why it matters: Sticking to facts makes your communication court-safe and leaves no room for “he said, she said” arguments. Facts are neutral. Opinions are weapons.
Bad example (defensive, emotional): “You’re asking about the kids’ dentist appointment like you suddenly care about their health. I’ve been handling all their medical appointments for years while you do nothing. But fine, it’s Tuesday at 3pm.”
BIFF example: “The dentist appointment is Tuesday, April 15 at 3pm. Dr. Martinez, 123 Main Street. I’ll send you the paperwork afterward.”
Friendly
Neutral to warm. Professional. Like you’re communicating with a coworker you don’t particularly like but need to work with.
Why it matters: This is the hardest part for most people, but it’s crucial. A friendly tone doesn’t mean you’re weak or that you’ve forgotten how they treated you. It means you’re being strategic. Courts notice who maintains professionalism and who doesn’t.
Bad example (hostile): “Here’s the information you should already have if you paid attention to anything involving the kids.”
BIFF example: “Here’s the information you requested about soccer practice. Let me know if you need anything else.”
You’re not friends. You’re business partners in raising kids. Friendly means professional courtesy, nothing more.
Firm
End it. Don’t ask open-ended questions. Don’t invite further discussion unless necessary. Close the loop.
Why it matters: Every question you ask, every open-ended comment you make, gives them an opportunity to continue the conversation. With high-conflict people, that usually means more conflict.
Bad example (leaves it open): “Let me know what you think about this plan and if you have any concerns or different ideas about how we should handle things.”
BIFF example: “I’ll proceed with this plan unless I hear from you by Friday.”
Notice the difference? The second one has a deadline and a default action. No open invitation for endless back-and-forth.
BIFF in Action: Before and After
Scenario 1: Accusatory message about schedule
They send: “You’re always trying to change the schedule to make my life difficult. You don’t care about consistency for the kids. This is just more proof that you’re impossible to co-parent with.”
Non-BIFF response (what you want to send): “Are you kidding me right now? I asked to switch ONE weekend because my sister is visiting from across the country. You change the schedule all the time for your work trips and I never complain. This is so typical of you to make everything about yourself when I’m just trying to see my family.”
BIFF response: “I’m requesting to switch weekends on March 20-21. I can take your March 27-28 weekend in exchange if that works for you. Let me know by Thursday.”
See what happened? You answered the underlying question (what you want and what you’re offering in return), kept it factual, offered a solution, and set a deadline. Their emotional content got zero attention.
Scenario 2: Questions about your parenting
They send: “The kids said you let them stay up until 11pm on a school night. I don’t know what you’re thinking but this is unacceptable and we need to talk about your parenting.”
Non-BIFF response: “That’s a complete lie and you know it. The kids are probably exaggerating or you’re twisting their words like you always do. I’m a good parent and I don’t need parenting advice from someone who lets them eat fast food every night.”
BIFF response: “The kids were in bed by 9pm on school nights last week. Their bedtime is consistent at my house. Let me know if you have questions about our routine.”
You corrected the misinformation with facts. You didn’t take the bait about your parenting being under scrutiny. You didn’t counter-attack. You just stated what actually happened and closed it.
Scenario 3: Hostile message about money
They send: “I can’t believe you’re asking for money for the school trip when you make twice what I make. You’re always trying to squeeze more money out of me. This is harassment.”
Non-BIFF response: “It’s not harassment to follow the custody agreement which says we split school expenses 50/50. Maybe if you bothered to read the agreement you signed you’d know that. And my income is none of your business. I’m asking for your half of a legitimate expense for your child.”
BIFF response: “The school trip is $200 total. According to our agreement, your share is $100. I’ve attached the invoice. Please send payment by April 1. Thanks.”
Facts. Dollar amounts. Deadline. No discussion of who makes what or accusations of harassment. Just the logistics.
When BIFF Doesn’t Work
BIFF isn’t magic. There are situations where it’s not the right tool:
When there’s a genuine emergency. If your child is hurt or sick, forget BIFF and just communicate clearly and directly. “Emma fell and needs stitches. I’m taking her to urgent care. I’ll call you when we know more.”
When you’re too angry to pull it off. If you can’t write a BIFF response without dripping sarcasm, don’t send it yet. Wait. Get calmer. Try again. A bad BIFF response is worse than no response.
When they need more information to make a decision. Sometimes you actually need to have a longer conversation about something like school choice or medical treatment. BIFF is for routine logistics and deflecting hostility, not for collaborative problem-solving on complex issues.
When they’re escalating to threats or abuse. If communication has moved into threats of violence, parental alienation, or other serious concerns, BIFF is not enough. Document, contact your attorney, and potentially involve authorities.
Common BIFF Mistakes
Being too brief. “No” is not a BIFF response. You still need to be informative. “I’m not available that weekend. I can offer the following weekend instead” is better.
Being passive-aggressive. “I’ll try to be on time this time, unlike some people” isn’t friendly. It’s hostile. Cut it.
Asking unnecessary questions. “Does that work for you?” invites discussion. “I’ll plan on this unless I hear otherwise by Friday” doesn’t.
Taking every bait. You don’t have to respond to every message. If they’re just venting or making accusations without asking a question or needing information, you can often just not respond at all.
The Long Game
BIFF feels unnatural at first. It feels like you’re letting them “win” by not defending yourself. You’re not.
You’re playing a different game. They’re trying to get an emotional reaction. You’re trying to reduce conflict and create a clean communication record. Over time, BIFF does three things:
- Reduces the volume of hostile messages. When you stop feeding the pattern, many high-conflict communicators lose interest in texting novels. Not all, but many.
- Creates a court record that helps you. When your attorney shows the judge a year of BIFF responses next to their emotional tirades, it’s obvious who’s focused on the child and who’s focused on the fight.
- Protects your mental health. Every time you write a three-paragraph defense of your parenting, you’re re-traumatizing yourself. BIFF lets you handle necessary communication without getting pulled into the emotional chaos.
The Bottom Line
BIFF is a skill, not a personality trait. You don’t have to be naturally calm or patient to do it. You just have to be willing to practice.
Brief. Informative. Friendly. Firm.
Four words that can change the entire dynamic of your co-parenting communication. Not immediately. Not magically. But over time, with consistency, BIFF works.
Your ex may never respond well. That’s not the point. The point is you respond well. Every single time.
