Why Comparing Siblings Backfires — and What to Do Instead

It slips out so easily. One child brings home strong results and the other does not, and somewhere between concern and frustration a sentence forms: 'Your brother never had problems with maths.' The intention is nearly always motivational — here is proof it can be done, so do it. But decades of family research, and most adults' own childhood memories, agree on what the sentence actually does. It does not transfer motivation. It transfers resentment.

Why comparison fails as motivation

Comparison misreads what motivates children. A child does not hear 'your sister works hard' as strategy advice; they hear 'I rank my children, and you are losing.' The response is rarely increased effort. More often it is one of three things: quiet withdrawal from the subject, since not trying protects against confirmed inferiority; resentment aimed at the sibling, who never asked to be the benchmark; or, most corrosively, identity formation around the comparison — 'she is the smart one, so I must be something else.' Children build identities early from the labels available, and 'the not-academic one' is a label a seven-year-old can wear for thirty years.

The favoured child is not spared, either. Being the benchmark is its own burden: the pressure to keep the position, guilt toward the sibling, and a nagging suspicion that parental approval is contingent on staying ahead. Research on parental differential treatment finds it predicts worse sibling relationships and poorer adjustment for both children — the comparison costs the family twice.

Per-child benchmarks: the honest alternative

The alternative to comparing siblings is not pretending they are the same. They are not, and children know it — the honest move is to make each child's own trajectory the only scoreboard that counts at home.

• Measure against the child's own last result, not the sibling's current one: 'You were at 58 last term and 65 now — what did you do differently?' is motivating in a way no sibling reference can be.
• Set targets privately and individually. A 70 can be a triumph for one child and coasting for the other; the same number should not earn the same conversation.
• Praise different currencies. If one child collects academic praise and the other's genuine strengths — persistence, kindness, art, sport, humour — go unnamed, you have built a ranking without saying a word. Every child should hear specific, true praise for something regularly.
• Never let results out loud become a family event where one slip is read after another. Discuss each child's report privately with that child.
• Watch the subtle versions too: sighing at one child's grade in front of the other, or 'see, that is how it is done' at the dinner table, compares just as loudly as the explicit sentence.

Handling relatives who keep score

You can reform your own sentences and still lose the war at Chinese New Year, where 'so how did the PSLE go?' opens conversations and cousins' scores circulate like commodity prices. You cannot control relatives; you can control the script that runs when they start.

• Have a deflection ready and use it cheerfully: 'They are all working hard and we are proud of all of them — anyway, have you eaten?' Delivered warmly and repeatedly, it teaches relatives what topics go nowhere with you.
• Never let the comparison stand unanswered in front of the child. A light 'we do not really compare them' costs one second of social smoothness and buys your child the knowledge that you are on their side.
• Debrief afterwards if a child got stung: 'Ah Ma grew up thinking marks were everything. In this family, we care about whether you are improving and how you treat people.' Children can shrug off a relative's scorecard if the parents' scorecard is visibly different.
• Prepare the strong-scoring child too — coach them not to volunteer scores in front of cousins. Kindness about one's own good news is a lesson worth teaching early.

When one child genuinely struggles more

Sometimes the gap is real and persistent, and the struggling child sees it themselves — no parental discretion can hide a sibling's award ceremony. Do not deny the difference; children distrust adults who deny the obvious. Acknowledge it and reframe it: different people are built differently, timelines differ, and this family measures effort and progress, not position. Then make sure the struggling child has a domain — any legitimate domain — where they are visibly growing and celebrated. A child who is behind in maths but known at home as the family's best swimmer, baker, or joke-teller has somewhere to stand. A child who is simply 'the weaker one' does not, and children without somewhere to stand stop climbing.

Siblings will compare themselves quite enough without help. The parents' job is to be the one place where the ranking does not exist.