It usually starts over nothing. A particular cushion. Who got out of the car first. Whose turn it is to press the button on the pedestrian crossing — a button that, let's be honest, almost certainly does nothing. And there you are, kettle in hand, being summoned to deliver a verdict on a dispute you didn't witness and can't possibly judge fairly.
Most of us were sold a quiet lie about siblings: that if we just manage the fairness carefully enough, the fighting will stop. So we count out the grapes. We measure the screen time to the minute. We become a sort of in-house magistrate, and we wonder why the caseload never goes down. The uncomfortable truth is that the refereeing is part of the problem. When a parent steps in to settle every clash, the children learn something they'll use against each other for years: that the fastest route to getting what you want is to get Mum or Dad on side first.
Why being fair backfires
Equal and fair are not the same thing, and children can smell the difference. A four-year-old and a nine-year-old do not need the same bedtime, the same portion, or the same responsibilities, and pretending otherwise teaches the older one that competence gets punished and the younger one that helplessness gets rewarded. Aim for fair — meaning each child gets what they actually need — and you sidestep the endless accounting that comparison invites.
The comparison itself is the trap. The moment you say "your sister never makes this much fuss," you have handed both of them a scoreboard. One feels diminished; the other feels watched. Children who are constantly measured against a sibling don't compete less — they compete harder, because the stakes have just been raised to their standing in your eyes. Drop the running commentary on who is easier, tidier, or kinder, and a surprising amount of the rivalry has nothing left to feed on.
Step back without stepping out
Stepping back does not mean ignoring two children rolling around the hallway. It means changing what you do when you arrive. Instead of asking "who started it?" — a question that only ever produces two confident liars — narrate what you see and hand the problem back. "You both want the tablet. There's one tablet. I'm sure you two can work out a fair way to share it." Then, and this is the hard part, you leave the room.
The first few times, it will sound like the house is coming down. Sit with that. Most low-level squabbles resolve within a couple of minutes once the audience disappears, because the performance only works when there's someone to perform to. You're not abandoning them; you're showing them you believe they're capable of sorting it out, which is a far more useful thing to communicate than "I'll decide who's right."
There are limits to this, and it's worth being honest about them. If someone is genuinely getting hurt, or if there's a real power imbalance — a much bigger child leaning on a toddler — you intervene, fast and without debate. Stepping back is a strategy for the squabbles, not a licence to let the strong steamroll the small. The skill is telling the difference, and that takes a week or two of paying close attention before it becomes instinct.
The repair matters more than the rule
When you do need to step in, resist the urge to find the culprit and issue a sentence. Separate them, let the temperature drop, and come back to it later — not to assign blame, but to sort out the repair. What needs to happen now to put this right? Sometimes that's a genuine sorry, sometimes it's rebuilding the knocked-over tower together, sometimes it's just both of them admitting the whole thing was ridiculous.
This is where the real relationship gets built, in the unglamorous business of falling out and finding the way back. Siblings who learn to repair a conflict at six are practising the exact skill they'll need at sixteen and at thirty-six. The squabble over the cushion is, improbably, training for every future flatmate, colleague and partner.
Catch them getting on
One thing genuinely shifts the weather between siblings, and it costs nothing: noticing out loud when they're kind to each other. Not a song and dance — a quiet, specific "that was good of you to wait for him." We are exhaustively attentive to the fighting and strangely silent about the moments they build a den together or share the last biscuit unprompted. Flip that ratio. Children grow toward the version of themselves they hear described.
You won't end the rivalry. You're not meant to. A bit of friction between siblings is normal, even useful — it's how they learn to negotiate, defend a position, and lose without falling apart. What you can change is your role in it. Put down the whistle, step out of the middle, and you'll be amazed how much they can sort out the moment there's no one left to win over.