A dull log of dates, times and exact words will do more for you in mediation than a folder of grievances, and a secret recording can hurt your case more than it helps.
Write down what a stranger would need to understand the day a year from now: the date, the time, what happened, who was there, and any words that mattered, exactly as they were said. Leave out your opinion of the other parent, their private life, and anything you would have to get out of your children.
Memory goes first. Six months on, three late Fridays blur into “he’s always late,” and “always” is the word that gets picked apart in mediation. A note written the same evening says 6:42 p.m., which is much harder to dispute.
Think about who might read it: a mediator, a lawyer, a custody evaluator, a Cafcass family court adviser in England, a judge. They read for what happened, and for what kind of parent wrote it down. A sixty-page file of grievances can make you look fixed on the other parent rather than on your child, even when every grievance is true.
Volume has a cost of its own. In a 2025 Nova Scotia case, Power v. Power, working out which of the mother’s twelve secret recordings the judge would hear took two and a half days of trial time, days that had been scheduled for her request to relocate their seven-year-old son.
The last reason is quieter. If you’ve been replaying a handover at 2 a.m., putting it into the log in four flat lines is often what lets you put it down.
Every entry answers the same six questions: when, where, who was there, what happened (in order), what was said that matters, and what you did. Write it the same day if you can. Mark anything second-hand (“Leo told me that…”), because what you saw and what you were told carry different weight.
An entry that will still be useful in a year:
Fri, March 6, 2026. Handover at Dan’s building, scheduled 6:00 p.m. Dan came down at 6:42. No message before. Ava (7) and I waited in the lobby. Dan said, “Traffic.” I said, “OK, see you Sunday at 5.” Ava’s inhaler and reading folder were in her backpack; I told Dan.
The same evening, written the way you’ll be tempted to:
Dan 40 min late, as usual. Obviously doesn’t care. Probably at the girlfriend’s. Ava was devastated and I had to pick up the pieces AGAIN.
The second one feels truer at 7 p.m. A year later it’s useless. “As usual” and “again” point to dates that aren’t in the log. “Doesn’t care” is a guess about what’s in Dan’s head. “Devastated” is an adjective, and adjectives get argued with. What Ava did is harder to argue with: “At 6:30 Ava asked, ‘Is Dad still coming?’ She asked again at 6:38.” If a feeling matters, write down the behavior that showed it.
Two habits make a log more believable. Write the dull entries too (“Sun, 5:00 p.m., on time, no issues”), and log your own slips, like the Sunday you were twenty minutes behind. Three late handovers logged next to nine on-time ones are much harder to wave away.
Record what affects your child’s care or the arrangement itself:
In Lullia, swaps and handover times are timestamped in the shared calendar as they happen, so you aren’t rebuilding March from old texts in June.
Leave out the rest. You’ll feel the pull to log every irritation: the reply that took two days, the one-word “Fine,” the socks that never come back. Unless it adds up to a pattern that affects your child (permission slips not returned for three weeks running, say), it buries the entries that matter.
The other parent’s private life stays out too: who they’re dating, what they post, where they go without the kids. If a new partner’s behavior affects your child directly, record what happened; scrolling their Instagram for material reads badly if it ever comes out. Leave out diagnoses as well. “Narcissist” in a log does you no favors, even if a therapist once used the word.
For the wording of the messages themselves, see how to write to your co-parent without starting a fight.
Your children are not sources. “Did you have a good weekend?” is interest. “Who else was there? Did Mom have anyone over?” is a debrief, and children hear the difference. Never ask them to watch or report back: Families Change, the California courts’ site for separating parents, lists asking children to spy on the other parent as something not to do. A ten-year-old who learns that what she says ends up in your notebook will stop telling you things, including the things you need to know.
Teenagers sometimes volunteer. A 14-year-old who has watched you two fight may offer to screenshot Dad’s texts or record him. Say no kindly, and say why:
“Thanks, but I don’t want you sending me anything from Dad’s. Sorting things out with him is my job, not yours. If something there ever worries you, tell me and I’ll deal with it.”
Don’t record your children either. Courts in England and Wales generally do not approve of covert recordings of children, the Family Justice Council’s guide for parents says, and young people describe them as a breach of trust.
The exception is something worrying a child tells you without being asked. If Leo, 9, says at bath time, “Dad grabbed my arm really hard and it hurt,” stay calm and let him talk without firing questions. The NSPCC suggests not looking shocked, telling him he did the right thing and it isn’t his fault, and taking notes soon afterward:
“Thank you for telling me. You did the right thing, and it’s not your fault. I’m going to talk to someone who can help.”
Then write down his exact words, the time, what you said back, and whether you saw a mark. Take it to your pediatrician or GP, the school, child protection services, or the police if he’s in danger now. In the UK, the NSPCC helpline for worried adults is 0808 800 5000 (weekdays, 10 a.m. to 4 p.m.). In the US, Childhelp (800-422-4453) will talk it through, though it isn’t a reporting line.
Whether you can secretly record the other parent depends on where you live and, for phone calls, where they live.
In the US, federal law lets you record a conversation you’re part of, but states can be stricter. The Reporters Committee for Freedom of the Press counts about 11 states that mainly require everyone’s consent, among them California, Florida, Illinois, Maryland, Massachusetts, Pennsylvania and Washington. A few others, including Oregon, Connecticut and Nevada, treat phone calls and in-person conversations differently. For calls across state lines, RCFP advises assuming the stricter law applies. Getting it wrong can mean criminal penalties and being sued.
In Canada, section 184 of the Criminal Code makes intercepting a private communication an offense unless someone in the conversation consents. So recording a conversation you’re in is generally not a crime; recording one you’re not in, like a call between your ex and your child or a phone left running in a backpack, can be. Even when it’s legal, family courts weigh what a secret recording proves against the harm of admitting it, and Ontario courts have been especially cautious. In Power v. Power the judge admitted eight of the twelve recordings and still called secretly recording family members “an odious practice that should not be encouraged.”
In England and Wales, the Family Justice Council’s 2025 guidance says secret recordings are sometimes accepted as evidence and sometimes not. To use one, tell the court early, explain who is on it and why it matters, and be ready to hand over an unedited copy; you may have to apply for permission on Form C2. The court may also ask why you recorded. Without a very good reason, taping the other parent can be seen as an invasion of privacy or even harassment, which the court will weigh when deciding about your child’s welfare. Recording a court hearing, remote ones included, is contempt of court or a criminal offense.
Talk to a family lawyer before you record anything you might rely on. Often there’s a simpler fix. If handovers go wrong, move them to school pickup or a public place. If calls turn into arguments, stop taking them and put arrangements in writing, which gives you a record without taping anyone.
Keep the screenshot and the original. You show the screenshot; you’ll need the original thread if anyone says it was edited or taken out of context.
When you take a screenshot, get the contact name and the date and time in the frame, and don’t crop. Then leave the original thread on your phone, even when it hurts to see it. Many apps, WhatsApp among them, can export a whole conversation with timestamps, which shows the messages around the one that matters. For email, keep the original and its header: the Safety Net Project at the National Network to End Domestic Violence (NNEDV) points out that a forwarded email loses information about where it came from. Some apps tell the other person when you screenshot; NNEDV suggests photographing the screen with a second device instead.
Never edit, trim or annotate the original file; keep your notes in a separate document. A screenshot with a convenient gap invites doubt about everything else in the file.
Back up to two places, at least one off your phone. Name files by date (“2026-03-06 handover text.png”) so they sort themselves. Photograph paper receipts the day you get them.
If you’re documenting abuse or coercive control, where the record lives matters as much as what’s in it. Check whether the other parent can still reach your accounts: a shared Apple or Google family plan, a tablet that syncs your notes, a laptop they set up, passwords they could guess. The National Domestic Violence Hotline suggests an email account used only for documentation, a backup drive, and copies kept with someone you trust, and warns that internet use can be monitored and is impossible to erase completely. NNEDV adds that printers, work ones included, may log what you print.
Write as if the other parent may read it one day. NNEDV notes that a log could be used as evidence in court and could end up shared with the abuser, so keep it flat and factual. It also warns that some abusers escalate when they learn they’re being documented, and that you are the best judge of that risk. An advocate through one of these services can help you weigh it:
If you’re in danger right now, call 911 (US and Canada) or 999 (UK).
If you’re now logging nearly every exchange, read about parallel parenting, which keeps contact between the two of you to a minimum.
This is general information, not legal advice; check with a family lawyer or mediator where you live.