Sibling rivalry
Squabbles over the front seat are normal. Constant cruelty is not. Here is how to tell the difference and how to respond without becoming the full-time referee.
Key takeaways
- Sibling rivalry is common, and much of it reflects children's changing needs, temperaments and competition for parental attention.
- Nemours KidsHealth notes that kids often copy how their parents handle conflict, so adult modeling matters.
- A UK study of more than 17,000 young people found sibling bullying, in any role, was associated with poorer mental health in late adolescence.
- A randomized trial of the Siblings Are Special program improved positive sibling relationships and children's self-control.
- Fair does not have to mean identical; children often need different things.
What sibling rivalry looks like
Imagine a long drive from Detroit to the Upper Peninsula. Twenty minutes in: “He’s touching my side.” An hour in: “She got the bigger snack.” By the Mackinac Bridge, everyone in the car is counting the minutes. Most parents know this soundtrack.
Sibling rivalry is the jealousy, competition and fighting that often show up between brothers and sisters. It can start when a new baby arrives and an older child suddenly shares the spotlight, and it can stretch into the teen years as kids carve out separate identities. In blended homes, stepsiblings add another layer (see blended family).
What causes sibling rivalry?
Nemours KidsHealth, the children’s health site reviewed by pediatric experts, points to several common drivers:
- Changing needs. A toddler guarding toys and a teen guarding privacy clash for different reasons.
- Temperament. Some personality pairings simply rub.
- Special needs or illness. When one child needs more parental time, others may feel resentful or act out.
- Role modeling. Children often copy how the adults around them handle disagreement.
Popular theories such as birth order are often offered as explanations too, but family patterns such as perceived favoritism usually tell a fuller story. When one child is cast as the golden child, rivalry can harden into lasting resentment.
When rivalry becomes something more
Ordinary rivalry goes both ways and blows over. Sibling bullying is different: one child repeatedly targets another with hitting, threats, humiliation or exclusion, and there is a power imbalance. Umar Toseeb and Dieter Wolke analyzed data from more than 17,000 young people in the UK and found that sibling bullying, whether a child was the victim, the bully or both, was associated with poorer mental health in late adolescence. As victimization became more frequent, outcomes tended to be more severe.
Common misconceptions
“Kids will be kids.” Bickering is normal, but repeated cruelty deserves adult attention.
“Being fair means treating everyone the same.” A seven-year-old and a fifteen-year-old need different bedtimes and different kinds of help. Children tend to accept differences better when they understand the reason.
“Siblings who fight will not be close later.” Many siblings who clashed as kids become important supports as adults.
What may help
Think of yourself as a coach more than a referee.
- Stay out of minor squabbles when no one is at risk of being hurt, and help kids work out their own solutions.
- Separate and cool down when tempers flare, then problem-solve without assigning all the blame.
- Set a few clear house rules about hitting, name-calling and yelling, and involve children in agreeing on consequences.
- Give each child one-on-one time doing something they enjoy.
- Skip comparisons. “Why can’t you be more like your sister?” fuels rivalry.
Sibling bonds can also be strengthened on purpose. In a randomized trial of Siblings Are Special, a 12-week afterschool program for pairs of siblings and their families, Mark Feinberg and colleagues found improvements in positive sibling relationships, children’s self-control and social competence, and parents’ strategies for handling siblings. The program did not reduce sibling conflict in the short term, a reminder that warmth and fighting can coexist.
How you respond also reflects your broader parenting style: warm, consistent limits tend to work better than either yelling or ignoring.
When to talk with a therapist
KidsHealth suggests seeking help when the conflict is straining the parents’ relationship, when someone may be physically hurt, when it is damaging a child’s self-esteem, or when it may be linked to something deeper, such as depression. Family therapy looks at the whole system, including how adults respond, rather than labeling one child as the problem.
Common questions
Is sibling rivalry normal?
Yes, some rivalry is a normal part of growing up together. Brothers and sisters compete for attention, space and belongings, and arguing can help them practice sharing, negotiating and repairing. It becomes a concern when it is one-sided, frequent and cruel, or when someone is being physically hurt.
At what age is sibling rivalry the worst?
There is no single peak age. Rivalry often appears when a new baby arrives, can be intense when children are close in age and competing for the same things, and may flare again in the teen years as children seek independence and privacy. Each stage tends to bring different triggers rather than simply more or less conflict.
How do I stop my kids from fighting all the time?
You may not stop it entirely, but you can reduce it. Set clear rules about physical aggression and name-calling, avoid comparing children, give each one individual attention, and help them problem-solve rather than deciding who is to blame. Modeling calm disagreement yourself also matters, since children often copy how adults handle conflict.
What is the difference between sibling rivalry and sibling bullying?
Rivalry is usually mutual and passes. Sibling bullying involves one child repeatedly targeting another, often with a power imbalance, through physical aggression, threats or humiliation. Research by Toseeb and Wolke found that sibling bullying was associated with poorer mental health later in adolescence, so it deserves active adult intervention.
Sources
- Sibling Rivalry (Nemours KidsHealth, reviewed March 2023)
- Toseeb U, Wolke D. Sibling Bullying: A Prospective Longitudinal Study of Associations with Positive and Negative Mental Health during Adolescence. J Youth Adolesc. 2022;51(5):940-955 (PMC)
- Feinberg ME, Solmeyer AR, Hostetler ML, et al. Siblings are special: initial test of a new approach for preventing youth behavior problems. J Adolesc Health. 2013;53(2):166-173 (PMC)