Why Families Need to Pay More Attention to Sibling Rivalry

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Perhaps, given the biblical story of Cain and Abel, it shouldn’t have come as a big surprise but in interviews for my forthcoming book on verbal abuse, I was struck by how many respondents reported being verbally abused by a sibling in their families of origin. In some cases, the abuse was an echo of parental verbal abuse, and the abuser was joining in both to keep him or herself safe from becoming the target and to establish loyalty to the abusive parent. This is especially true in a family where a mother or father is high in narcissistic traits, hypercritical, controlling, or highly combative. In these families, siblings are frequently pitted against each other. That was true for “Joe,” now 42:

“My father was a tyrant; there was a right way of doing things, which was his way, and a wrong way, and woe to the son who didn’t do it his way. My mother was his accomplice, using shaming to get us to stay in line, and praising the merits of ‘sibling rivalry.’ My brother is five years older and he bullied me to show my dad how strong he was. Believe it or not, I thought this was how all brothers were until I started to notice that my friends had brothers who were actually friends. I have as little to do with my parents and brother as possible and I have worked hard at making sure my own boys are never compared to each other or encouraged to belittle each other.”

This story focuses on a son’s experience but it happens between sisters as well, especially when a mother or father plays favorites or uses the achievements of one daughter to belittle or browbeat another, and the favored daughter becomes verbally abusive to her sibling as well.

How the term “sibling rivalry” blinds us to sibling abuse

But, sometimes, a sibling’s verbal abuse isn’t an echo but an act of individual aggression, and it’s sad that parents don’t always recognize it as such and write it off as a function of “sibling rivalry” — a supposedly a “normal" occurrence in families with more than one child.

In his 2012 book Sibling Aggression, Jonathan Caspi noted that this normalization isn’t just limited to laypeople but to professionals as well. He writes that despite a growing body of research which shows otherwise, “the mistaken belief that sibling violence is not harmful normalizes it. Statements such as ‘My brother beat on me and I am fine’ and ‘Boys will be boys’ minimize honest appraisals of possible effects and validate its continued use.” He notes that practitioners too grew up with the same social context—thinking that sibling aggression is normal—and so their judgments about family dynamics are often clouded by their own internalized views. He surmises that this point of view limits research as well. He uses sibling aggression as an umbrella term which encompasses four categories which he arranges in order of effect, going from most mild to severe; in order, they are competition, conflict, violence, and abuse.

Understanding competition between siblings

Healthy competition can motivate and challenge siblings to develop their skills and talents. Famous siblings in sports — the Williams sisters or the Manning brothers — immediately come to mind. But when the aim of the competition is to highlight one sibling’s flaws or inadequacies, competition moves from being inspirational to being hurtful and damaging. (Think about the Jackson Five, their siblings, and their abusive father, for example.) Caspi notes that most of the time, one sibling’s advanced skills don’t damage another’s self-esteem.

Surveying conflict in sibling relationships

Every family experiences some amount of conflict and, as Caspi notes, constructive sibling conflict promotes social and emotional competence, teaches problem-solving, and helps a child hone his or her emotional regulation. My own thought is that, for this to happen, parents have to have modeled and implemented cooperative ways of dealing with disagreements and conflict. In households where verbal abuse is the default, this isn’t going to happen.

But even in a household where constructive behavior has been modeled, it’s clear that constant negative conflict between siblings can alter the dynamics of a family as well as the sibling relationship.

Is roughhousing violence between siblings?

Caspi notes that the terms sibling violence and sibling abuse are often used interchangeably because they both entail physical and verbal acts that intend to do harm. However, he distinguishes violence from abuse. He writes: “Violence reflects mutual or bidirectional aggression in which both siblings aim to harm each other in a concert of perceived egalitarian relationship.” Sibling physical violence — hitting, biting, pinching, kicking — is astonishingly prevalent; some researchers’ estimates are as high as 96 percent of all families while others put it at 80 percent. But, as Caspi points out, physical violence is very difficult to distinguish from animated roughhousing or even rough-and-tumble play so these numbers may be greatly inflated because of parental confusion about what’s “normal” between siblings and what’s not. Most importantly, research supports Caspi’s contention that this kind of mutual sibling violence doesn’t damage self-esteem.

Some readers will share my initial confusion, reading that this “even-steven” and mutual mano a mano type of violence isn’t necessarily harmful or damaging, but that is what research shows. Let’s consider rough-and-tumble play, for example. Joseph L. Flanders, Vanessa Leo, and their colleagues cite research showing that physically aggressive behaviors are observable as early as 18 months but begin to taper off in most children by age two or three; their study looked at father-child rough-and-tumble play (RTP) to determine whether a father’s behavior influenced a higher incidence of continuing physical aggression in children. It’s widely recognized that fathers play with children differently than mothers do, regardless of gender, and that kids prefer Dad's style of play over Mom's.

RTP is characterized by aggressive behaviors such as “wrestling, grappling, jumping, and chasing in a play context.” Fathers often socialize both sons and daughters through this kind of physical play which is associated positively with emotional regulation, self-control, reading emotional cues, and even sensitivity to others. These are important skills for self-development and permit children to negotiate social rules in peer settings with more ease. What Flanders and his team found was that when fathers controlled and set limits during RTP, their children demonstrated lower levels of physical aggression in daily life; in contrast, the children of fathers who didn’t set limits and shucked off dominance were more likely to be more physically aggressive in later life.

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So mutual or bi-directional physical aggression actually has its benefits, as counterintuitive as that may seem.

When it’s not mutual, it’s abuse

The distinction that Caspi makes between violence and abuse largely rests on power; if he considers the first to be “bidirectional” or “mutual,” then sibling abuse is “unidirectional hostility where one sibling seeks to overpower the other via a reign of terror and intimidation, and reflects an asymmetrical power arrangement.” The abusive sibling not only wants to humiliate and render the other powerless but he or she is intent on aggrandizing him or herself through the act. Caspi notes four kinds of sibling abuse—physical, sexual, psychological or verbal, and relational—but verbal abuse is by far the most prevalent. Among siblings, verbal abuse includes insults, name-calling, and threats to property. Again, because siblings do chivy for attention in the household, it may be difficult for the parents to distinguish between chivying, an expression of frustration, and verbal abuse which is about dominance.

Beyond sibling rivalry

It’s clear that we need to retire the term. If you’re an adult who experienced sibling abuse but have rationalized or downplayed it, now’s the time to stop and reflect on its effects. Speak out. You may get pushback because families guard their narratives fiercely but it’s time you stepped out of the role assigned you, whether that’s the “sensitive one” or “the wuss.”

If you’re a parent of siblings, pay close attention to not just your behaviors but theirs. Step in if necessary.

Copyright © 2022 by Peg Streep

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