Few conversations feel harder than this one. You may have been turning the words over for weeks, testing different openings in your head, worrying about the moment their face changes. That worry is a sign you care about getting this right, and it already puts you ahead of where you might think you are.
There's no single script that works for every family, but there is a good deal known about what helps children come through this conversation feeling safe, and what tends to make it harder for them. This is a starting point, not a rulebook.
Before you sit down to talk
Where possible, tell your children together. A united, calm presentation, even from two parents who are struggling with each other privately, gives children something steadier to hold onto than hearing it from one parent first and the other later. If telling them together truly isn't possible, aim to tell them close enough in time that they aren't carrying the news alone or hearing two different versions.
Choose a moment when there's time afterwards to be together as a family, not rushing to school or heading into a bedtime routine. A weekend afternoon, with no plans immediately after, gives everyone room to react, ask questions, or simply sit with it for a while.
It helps enormously to agree beforehand, as much as you're able to, on what you're going to say and how far you'll go if your children ask why. You don't need a rehearsed speech. You do need to know you won't contradict each other in front of them, and that neither of you will be caught off guard by a question you haven't thought about.
What to actually say
Keep the core message simple. Something close to: we both love you very much, that will never change, and we've decided we're not going to live together as a couple any more. Children don't need, and shouldn't be given, the reasons behind adult decisions. What they need is reassurance that the two things they're most afraid of, losing a parent's love and losing safety, aren't happening.
Expect questions, and answer the practical ones honestly. Where will I sleep? Will I still go to my school? Will I still see my friends? These are the questions that settle a child, far more than any explanation of what went wrong between the adults. If you don't know an answer yet, it's fine to say so, as long as you follow it with reassurance that you'll let them know as soon as you do.
Say plainly that none of this is their fault. Children, especially younger ones, often quietly believe they caused it somehow, and that belief can sit unspoken for years if nobody addresses it directly.
For younger children
Roughly between two and seven, children need concrete, simple information delivered warmly and calmly. They aren't ready for reasons and don't need them. What settles a young child is knowing where they'll sleep, who will collect them from nursery or school, and that both parents still love them. Be prepared to answer the same questions more than once. Repetition is how young children process something this big, not a sign that the first answer didn't work.
For children between eight and twelve
A little more explanation is appropriate here, but the details of adult conflict have no place in it. Focus on what's staying the same as much as what's changing. Let them ask questions, and answer honestly but briefly, without filling the silence with information they didn't ask for.
For teenagers
Teenagers can generally handle, and often need, more openness than younger children, because they'll draw their own conclusions if left without any explanation at all. They may have strong opinions about how things will work, and those opinions are worth listening to seriously, even though the final decisions remain with the adults. What teenagers need most is to feel respected rather than managed, and to know clearly that neither parent's love depends on which side they seem to take.
Two things that matter whatever their age
Never speak negatively about the other parent in front of your children, in this conversation or any that follows. And never ask your children how the other parent is feeling, what they said, or what's happening at the other house. Both of these place a child in the middle of something they should never have to carry, and both are easy to slip into without meaning to, especially in the early weeks when emotions are close to the surface.
After the conversation
This isn't a single event you get through and then move on from. Children tend to return to it in pieces, sometimes days or weeks later, sometimes in the middle of something unrelated. A question in the car. A comment at bedtime. Stay open to those moments rather than treating the conversation as closed once it's happened.
Watch for changes in sleep, appetite, behaviour at school, or mood, particularly in the weeks that follow. Some reaction is normal and expected. If it persists, or if you're simply not sure whether what you're seeing is within the range of ordinary adjustment, that's worth raising with their school or GP, or with a counsellor who works with children and families.
If you're not sure you can do this alone
Many parents come to counselling not because anything has gone wrong, but because they want support in getting a moment like this right, for their own sake as well as their children's. If you'd find it helpful to talk through what to say, how to handle a particular question you're dreading, or simply how you're holding up, that's exactly the kind of thing counselling can help with.
I offer a free 20 minute consultation if you'd like to talk before deciding whether counselling is the right next step. And if you're looking for more detailed guidance on navigating separation as a parent, my book, When Divorce Gets Messy, covers this stage and many of the ones that follow.