Your eight-year-old is at the kitchen table doing math homework, stuck on the same problem for ten minutes. You lean over and, without thinking, say, You get that from your dad. He could never sit still with numbers either. You meant it lightly. But watch her face. Something closes, just a little. She has learned two things at once: that this part of her comes from him, and that you don't think much of it.
That is the uncomfortable truth this article is about. Your child isn't only listening to what you say about your ex. She's listening to what you say about the half of her that came from your ex. To a child, those are the same sentence.
Your child is built out of both of you
Adults can hold a clean line between my ex and my child. We know the divorce was between two grown-ups. Children don't experience it that way, and it isn't because they're naive. It's because of how identity forms.
Kids build a sense of who they are partly by identifying with their parents. They notice they have their mother's laugh, their father's hands, one parent's temper and the other's stubbornness. Long before they can explain it, they understand that they are made of both of you, biologically and otherwise. So when one parent describes the other as lazy, selfish, crazy, or useless, the child doesn't file it away as a fact about someone else. They hear something about themselves: the part of me that's like him is the bad part.
Family therapists have a name for the bind this creates. Ivan Boszormenyi-Nagy, a founder of family therapy, called it split loyalty: the child feels that loving one parent means betraying the other. Researchers who study children after divorce usually call it a loyalty conflict, and they keep finding that it's one of the things that predicts how kids fare. It tends to matter more than the divorce itself, and often more than the custody schedule. A child stuck in a loyalty conflict has to manage a problem no child should have to: how to love someone their other parent despises without losing that parent's approval.
The research on parental denigration (one parent putting down the other in front of the child) points the same way. It's associated with worse outcomes for children, and it can also backfire on the parent doing it. Kids often grow closer to the parent being criticized and feel resentment toward the one doing the criticizing. Children are fiercely fair. When they sense an attack on someone they love, they tend to defend that person, quietly or out loud.
Why neutral isn't enough
Most coparents who've done a little reading already know not to badmouth. So they go neutral: say nothing, change the subject, keep their face blank when the other parent comes up.
That's better than contempt. But children practice something developmental psychologists call social referencing: when they're unsure how to feel about something, they read the face of a trusted adult. Infants do it at the edge of a visual cliff. Older kids do it at the edge of an emotional one. When your child mentions their other parent and your face goes still, they're reading you, and stillness reads as a warning. We don't talk about that here.
Silence leaves a gap, and children fill it with their own guesses. Often the guess is that their love for the other parent is something to hide in your house. That's how kids end up living as two slightly different people in two homes, editing themselves at every handoff.
What helps is small, genuine, positive mention. Not a speech or a performance of forgiveness. Just ordinary, true sentences that tell your child it's safe to love both of you here.
The sentences that do the work
This isn't about pretending your ex is wonderful. You may have very good reasons to be angry. Children can tell when you're being fake, and fake warmth feels almost as unsafe as coldness. The skill is finding things that are true and kind, and saying them out loud.
Almost every coparent, even in a bitter split, can find some:
- Your mom is really good at making things fun on a rainy day.
- That's such a Dad joke. He always could make me laugh.
- You're brave like your father. He never backed down from hard things.
- Your mom loves you so much. I've never doubted that.
Look at what these do. They link a trait the child has to something good in the other parent. They show the child that you can say the other parent's name without tension. And they hand the child permission they'd never ask for: you're allowed to love her, and I'm okay.
The homework moment from the opening can be redone. Same stubborn math problem, same fidgeting kid: Your dad's a big-picture thinker. Details drive him crazy too, but he always figures it out. So will you. The trait is the same and the source is the same, but the child now sees it as something she can grow out of, not a flaw she was born with.
When there's nothing nice to say
Some readers are thinking about an ex who really did cause harm, through addiction, deception, or something worse. Positive talk is not a mandate to lie, and it's not a mandate to defend dangerous behavior. Children who've been hurt need their experience acknowledged, not papered over.
Even then, there's usually room for a narrower truth. You can separate the person from the behavior: Your dad has a sickness that makes him make bad choices. That isn't who you are, and it isn't your fault. You can name love without endorsing conduct: I believe your mom loves you, even when she doesn't show it well. What matters is keeping your child from concluding that half of them is broken. If you need help with this, a child therapist experienced with divorce can help you find wording that fits your situation.
The bar isn't praise. The bar is: don't make my child ashamed of where they came from.
The cost to you, and why it's worth it
Let's be honest about how this feels. Saying something kind about a person who hurt you can feel like losing an argument nobody else knows you're having. It can feel like you're letting them off the hook, or erasing what happened.
You aren't. You're making a choice about who carries the weight of your conflict. Every warm sentence you say about your ex in front of your child is a sentence your child doesn't have to defend, smooth over, or carry to the other house. You're taking the job of managing the adult relationship off your child and keeping it where it belongs.
There's a quieter benefit too. People often find their feelings follow their words over time, not only the other way around. Coparents who practice naming the good, even small good, sometimes notice the old resentment loosening its grip, because they've stopped rehearsing it.
Your next moves
- Write down three true, positive things about your ex tonight. They can be small: a skill, a quirk, a moment with the kids. Keep the list on your phone so they're ready when you need them.
- Use one of them in front of your child this week. Tie it to a trait your child shares if you can: You're creative like your mom. Then let it go. No follow-up, no speech.
- Notice your face the next time your child mentions their other parent. Instead of going blank, try a small smile and a curious question: Oh yeah? What did you two do?
- Catch one sentence that starts with "You get that from..." and finish it kindly, or don't finish it at all. These offhand connections are where most damage and most repair happen.
- Ask the adults around your child to follow the same rule. Grandparents, new partners, and friends can undo your work with one eye-roll. A short, private please don't criticize their dad in front of them protects a lot.
Where Coparent fits in
It's easier to speak kindly about someone when every exchange with them isn't a fresh fight. That's part of why we built Coparent: timestamped exchanges, messages that can't be edited after the fact, clear expense splits, and a one-tap court-ready export if you ever need it. It keeps the logistics and the record in one calm place so they don't leak into your kitchen or your face when your child brings up their other parent. It won't find the kind words for you, but it can lower the noise enough that you can find them yourself. If that sounds useful, you can take a look at coparent.lumenlabs.works.