Sibling Conflict
What’s Really Happening Between Them (And What Helps When It Feels Like a War Zone!)
You’re in the kitchen making dinner. Things have been relatively calm for about ten minutes, which you’ve learned to appreciate as a minor miracle. Then it starts. A roar from the sitting room. Then another. Then the thundering of feet and your seven-year-old appears in the doorway, face red, absolutely raging: “She TOOK my thing and she WON’T GIVE IT BACK and she called me STUPID and I HATE HER.”
From the sitting room: “I didn’t even DO anything! He’s LYING!”
And you’re standing there, potato peeler in hand, trying to figure out what just happened, who started it, whose fault it is, what the right consequence is, and why on earth you can’t get five minutes of peace in your own home.
If this sounds familiar (and I’m guessing it does!), welcome to one of the most exhausting, relentless features of family life with more than one child: sibling conflict. It comes up constantly in my work with families, and it’s one of those things that can make an otherwise manageable day feel completely unbearable. So let’s look at what’s actually going on, and more importantly, what actually helps.
Why They Fight: What’s Really Happening
Sibling conflict is completely normal. In fact, in many ways it’s developmentally necessary. That doesn’t make it easier to live with, but understanding why it happens can really shift how we respond.
Siblings are in constant, close proximity with each other. They share space, they share parents, they share resources. And they’re doing all of this at different developmental stages, with different emotional regulation capacities, different needs, and different temperaments. Of course they clash! It would be strange if they didn’t.
They’re competing for you. This is the big one, and it’s worth sitting with. Beneath a lot of sibling conflict is a fear, often unconscious, that there isn’t enough parental love and attention to go around. When your younger child gets a cuddle, your older child picks a fight. When your older child gets praise, your younger one suddenly “needs” something urgently. The behaviour at the surface (the grabbing, the name-calling, the winding up) is often the tip of a much more vulnerable, insecure iceberg underneath. What they can’t say is: “Am I still loved as much? Do I still matter as much to you? Do you love him more? Am I enough?”
One child’s dysregulation affects everyone. When one child is tired, hungry, overwhelmed, or anxious, their threshold for frustration drops dramatically. And in the closed ecosystem of a family home, that dysregulation is contagious. One child in a bad state will often provoke, irritate, or escalate the others, sometimes without even meaning to. The siblings fight, but the root cause was one child already struggling before the first word was exchanged.
Developmental clashes are real. A five-year-old and a nine-year-old don’t just have different interests, they have fundamentally different brains. The younger child isn’t developmentally able to take turns the way the older child expects. The older child has more sophisticated language and will always “win” a verbal argument, which infuriates the younger one. The mismatch in capacity is built in, and it creates friction.
Sometimes they’re genuinely just winding each other up. Let’s be honest: children also fight because it’s stimulating, because they’ve learned it gets a reaction, because they’re bored, and because pushing a sibling’s buttons is sometimes just more fun than whatever else is on offer. This is normal too! It doesn’t mean they’re bad children or that you’ve failed. It means they’re children.
What’s Really Underneath
If you zoom out and think of sibling conflict as communication (the way we’ve been doing with all behaviour in these articles), the question to ask is: what is this telling me?
Often, the fighting is telling you that one or both children need more of you. Not all of the same thing, and not necessarily more time, but more of the right kind of attention: one-to-one, focused, unhurried. When individual connection needs are being met, sibling conflict often reduces. It doesn’t disappear (let’s be realistic!), but reduces.
The fighting is also sometimes telling you that something else is going on. A child who suddenly starts fighting much more with their sibling might be struggling socially at school, or feeling anxious about something, or going through a developmental leap that’s taking up all their resources. The sibling becomes the nearest, safest target for feelings that have nowhere else to go. We need to look at the whole picture, not just the behaviour in the room.
What Doesn’t Help
When sibling conflict is at its height, most of us do the completely understandable thing: we try to figure out who started it, we pick a side, we hand out consequences, we threaten (“if you two can’t get along, we’re turning off the telly!”), and we demand they sort it out and be nice to each other right now.
None of this is wrong or terrible! But it almost never works, and it often makes things worse. When you focus on who started it, you position yourself as judge and jury in their conflict, which means both children put their energy into convincing you that the other one is to blame. You’ve now got two dysregulated children AND an adversarial (he said, she said) dynamic. Nobody’s nervous system is settling. And “be nice to each other” tells them nothing about how to actually do that.
The other thing many parents do (and I completely understand why, given how exhausting it all is!) is simply tune it out. Leave them to it. Hope it resolves itself. And sometimes that’s fine, as we’ll come to. But when ignoring becomes the default response, it sends a message children can’t unhear: that what’s happening between them doesn’t matter enough to warrant your attention. That it’s okay to be cruel to someone when you’re frustrated or need to let off steam. That relationships work like that. Children who grow up without anyone helping them navigate conflict can carry that into their friendships, their school life, their adult relationships. They might feel bad about themselves without quite knowing why, or struggle to understand why their relationships feel difficult. None of this needs to be dramatic or alarming, but it’s worth naming: your presence in these moments, even imperfect presence, matters more than you might think.
What Actually Helps
Stay regulated yourself, and watch your shark music. (I know, I keep coming back to this! But it really is the foundation.) Sibling conflict has a way of hitting our own nervous systems hard. Maybe it brings up memories of your own sibling relationships. Maybe you were the one who was always blamed, or the one who felt invisible, or the one who was frightened by conflict at home. That old shark music will play every time your children clash, and it can pull you towards reacting in ways that aren’t really about what’s happening right now. Notice when your reaction feels bigger than the situation warrants. That’s a signal worth attending to.
Step back before you step in, if everyone is safe. Not every conflict needs immediate adult intervention. When we rush in every time, we rob our children of the chance to figure it out themselves. If nobody’s going to get hurt, give them a moment. Watch what happens. You might be surprised. But when things escalate: step in calmly, not as judge, but as the person who holds both children’s perspectives.
Some things are non-negotiable. Before anything else, be clear (with yourself and with them) about what the absolute limits are. Hitting, kicking, name-calling that’s genuinely cruel, things that humiliate or hurt: these are not okay, and they need to be named as such without ambiguity. You can be warm and firm about this at the same time. “I can see you’re both really angry with each other right now, and that’s okay. But we don’t hit in this family. Full stop.” You’re not shaming them. You’re holding the limit. That’s your job, and it’s actually reassuring to children when adults are clear and steady about this. The rule exists not because they’re bad, but because they matter to each other and they need to learn to keep each other safe.
Help them regulate their bodies first. When children are really dysregulated, reasoning with them is pointless (remember the three R’s: regulate, relate, then reason). Before any conversation can happen, bodies need to settle. Sometimes separation helps. Sometimes what’s actually needed is something physical first: a jump on the trampoline, a run around the garden, a few minutes kicking a ball. Sensory and physical activity is one of the fastest ways to help a child’s nervous system settle. If you can, signpost them to this before you try to talk. “Go and do five big jumps on the trampoline. I’ll be here when you get back.” It sounds too simple, but it works!
Narrate without taking sides. Once they’re a bit calmer, try: “I can see everyone is really upset right now. Something went wrong between you two. Let’s take a breath together.” You’re not assigning blame. You’re not taking sides. You’re just naming what you see and bringing some steadiness into the room. You’re holding both of them, equally, at the same time. This is the authoritative part of parenting: not harsh, not permissive, but clear and present. Both children need to feel that you’re on their side, even while you’re not taking either side.
Help them hear each other. This is where your role as facilitator really matters. When everyone’s calmer, help each child put their experience into words, and then make sure the other one actually hears it. Not just waits for their turn to talk, but genuinely hears it. “Okay, let’s try something. I want you each to tell me what happened, and I want the other one to listen without interrupting. Can we try that?” Then reflect back what each child said, so both of them feel heard. “So you felt like she never lets you use it, even though you asked. And you felt like he grabbed it without warning and it scared you. I can hear that was really annoying and upsetting for both of you.”
When children feel genuinely heard in a conflict (not just told they were right), something shifts. They become slightly less combative. They don’t need to fight as hard to make their point when someone has already made it for them. And crucially, they start to hear each other. That’s the beginning of empathy between siblings, and it’s worth nurturing every time you can.
Then help them repair with each other. This is the reasoning step, and it comes last, after the regulating and relating. “Now that we’ve heard each other, what could you both do differently next time? And is there anything you want to say to each other now?” Don’t force an apology, a forced sorry means nothing and children know it. But create the space for one. Sometimes they’ll surprise you. And when they do manage a genuine repair between themselves, name it: “That was a really grown-up thing you both just did. That’s how people who care about each other sort things out.”
Come back to it when everyone is calm. If the conflict was significant, a proper family conversation later (not immediately, when everyone’s still raw) can be really valuable. “You two clashed badly earlier. I’ve been thinking about it. What was going on for each of you? What could we do differently next time things get hot between you?” This is a conversation, not a lecture. You’re curious, not annoyed. And you’re teaching them something that will genuinely serve them for life: that conflict doesn’t have to mean the end of a relationship, that you can fall out badly and still come back to each other, and that talking about hard things (even when it’s uncomfortable) is how people who love each other stay close. These are not small lessons. They’re the ones that shape how your children will manage every important relationship they ever have.
Address connection needs, not just the conflict. After things have settled, have a quiet one-to-one with each child separately. Not to debrief the conflict, but just to connect. “That was tough earlier. How are you doing now?” Even five minutes of that individual attention does something important. It reminds each child that they have their own relationship with you, separate from the sibling dynamic. That alone reduces the competition.
The “Fair vs Equal” Question
One thing that drives sibling conflict (and parental guilt!) is the idea that everything has to be fair. It doesn’t. Equal and fair are not the same thing. A six-year-old and an eleven-year-old don’t need the same bedtime, the same amount of supervision, or the same rules. What children need is to feel that their individual needs are being seen and met. “I know this feels unfair. Your sister gets to stay up later because she’s older. When you’re her age, you’ll have the same bedtime.” Matter of fact, warm, no drama. That’s not unfair. That’s good parenting.
What one parent discovered: “I used to think my boys just hated each other. The fighting was constant and I was at my wit’s end. A colleague suggested that I try giving each of them 15 minutes alone with me every day, no phones, no multitasking, just them. Within two weeks, the fighting dropped significantly. Not gone, but so much less. My younger one told me one evening: ‘I don’t hate him, Mam. I just feel like you like him more.’ That stopped me in my tracks. He’d been fighting with his brother because he was scared there wasn’t enough of me to go around and felt insecure with me. He didn’t need me to fix the sibling relationship. He needed me to really hear him and spend quality time with him on his own. This showed him just how much he matters to me.”
Moving Forward
Sibling conflict won’t disappear. It’s part of growing up together, part of learning to navigate relationships, and part of what makes family life both maddening and rich. The goal isn’t silence and perfect harmony! The goal is children who feel secure enough in your love to work through conflict, who are gradually developing the skills to manage disagreements, and who know that even when things get messy between them, the family holds. The sibling relationship, when it’s supported well, is one of the most important and enduring relationships of their lives. How they learn to treat each other now (to hear each other, to repair with each other, to disagree without being cruel) will shape how they move through the world. That’s worth investing in, even when it’s exhausting.
You’re not failing when they fight. You’re raising humans who are learning how to be in relationship with each other. That’s difficult, important work.
This Week, Try...
Pick just one thing from this article to experiment with. Maybe it’s stepping back for thirty seconds before you intervene in the next conflict (as long as everyone’s safe). Maybe it’s trying to narrate without taking sides: “I can see you’re both really upset right now.” Maybe it’s signposting them to the trampoline or the garden before you try to talk. Or maybe it’s building in five minutes of one-to-one time with each child this week, separate and focused.
And notice what comes up in your own body when they fight. What does it trigger? That’s worth reflecting on too.
A question to reflect on: What was your sibling relationship like growing up? Was there a lot of conflict, or very little? Did you feel your parents handled it fairly? How might your own experience of being a sibling be influencing how you feel and respond when your children fight?
Next week, we’ll be looking at something your children need more than almost anything else, and that you’re probably doing without even realising it: play. Why playfulness matters so much more than we give it credit for, why it’s the first thing to go when we’re exhausted, and how even a tiny bit of silliness can completely shift the dynamic between you and your child.
What does sibling conflict look like in your house? I’d love to hear in the comments. The more specific the better, because the more you share, the more I can tailor future articles to what you’re actually living with!
If this resonated with you, please share it with another parent who might need to read it this week.
Dr Daire Gilmartin Consultant Counselling Psychologist and Psychotherapist Oak Tree Therapy www.oaktreetherapy.ie