BIFF Method: How to Respond to a High-Conflict Ex Without Making It Worse

If you're co-parenting with someone who runs hot — long emails, accusations, paragraph-stacked texts, screenshots forwarded to the kids' school — you already know the trap. You read her message. Your chest tightens. You spend two hours writing a response that explains, clarifies, defends, and corrects every false claim. You hit send. She replies with four more pages.

You just spent your weekend feeding the conflict. The court file just got two more exhibits in her favor.

The fix is a framework called BIFF, created by Bill Eddy at the High Conflict Institute. Brief. Informative. Friendly. Firm. It's the single most useful tool a co-parenting dad can carry — and it takes maybe three minutes to write a response instead of two hours.

The four rules

• Brief — three to five sentences, total. If your reply is longer than her original message, you're losing.
• Informative — facts only. Dates, times, logistics, schedules. No interpretation, no 'I think you actually meant.'
• Friendly — not warm, not chummy. Neutral and polite. The friendly tone is for the judge reading the thread, not your ex.
• Firm — close the door. Don't invite a reply. Don't ask a question. 'See you Friday at 4:30.' Done.

Each rule has its own traps and its own workarounds. The full BIFF Scripts pack has 60 pre-written templates organized by scenario — schedule changes, accusations, vacation requests, school logistics, parenting decisions, holiday handoffs, last-minute cancellations. You copy, edit two words, send.

One worked example

"I can't believe you didn't text me back about Olivia's recital. You never prioritize her. The kids notice. Maybe if you cared as much about them as you do about yourself we wouldn't even be in this situation."

The wrong response is to defend, explain, list every recital you attended, and remind her who paid for the dance lessons. The right response is BIFF:

"Thanks for the message. The recital is on my calendar for Saturday at 6 — I'll be there. Let me know if there's anything Olivia needs from me beforehand."

That's the shape. The 60 scenarios in the BIFF Scripts pack cover the versions that don't unlock as easily — the ones where she's making an allegation that has to be addressed for the record, the ones where her demand actually needs to be refused, and the ones where silence is the right answer.

The mistakes BIFF prevents

1. 01Writing late at night when you're tired.
2. 02Sending the first draft (always wait an hour, ideally overnight).
3. 03'You' statements — 'you always,' 'you never.'
4. 04Listing past grievances.
5. 05Rhetorical questions ('how could you possibly…').
6. 06CC'ing the attorney to make a point. Judges and attorneys both see through this.
7. 07Sending five short messages instead of one written reply.

What if she keeps escalating?

She might. That's the point of BIFF — it gives you a sustainable response shape that doesn't cost you your evening. Send your three sentences. Don't read her reply for 24 hours. If she's running a campaign, your file of measured BIFF responses is the most powerful exhibit you can build.

Where the full playbook lives

This article is the framework. The BIFF Scripts pack is the 60 pre-written responses organized by scenario, plus the annotation notes explaining WHY each version works. When the texts are coming faster than you can think, the pack is what you copy from.

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