In the domestic lexicon, narcissism often ends up on the living room sofa, between a mother who is too cold, a father who is too absent, a son who grows up on compliments as if they were sweets before dinner. It’s convenient, even reassuring, because it allows you to put a label on a complicated story: that person is like that because someone at home ruined them or treated them like a little emperor. Reality, however, when measured across thousands of families, has less desire to follow our scripts.
New research conducted on twins and family members shifts the focus of the issue considerably. Narcissistic traits actually seem to recur within families, except that the transition from parents to children appears to be linked above all to the genetic component, while the shared educational style, the one that brothers and sisters experience in the same house, weighs very little. The study was published online on March 23, 2026, and used an extended family model to distinguish biological inheritance, common home environment, and individual experiences.
Before rushing with your imagination towards an aperitif diagnosis, it is best to stop for a moment. Here we are talking about narcissism as a personality trait, therefore a dimension that can include grandiosity, sense of entitlement, desire for social prestige, search for admiration. In some situations these traits can give confidence, initial charm, leadership skills. Over time, however, they can also produce conflicts, risky decisions, strenuous relationships and rather indigestible work environments.
The house weighs less than we say
For decades the most widespread explanation has almost always looked at the family. On the one hand, psychoanalytic readings, with the idea of narcissism as an armor built in front of cold, distant parents, incapable of offering warmth. On the other, learning theories, according to which a child put too much on a pedestal can end up developing an inflated self-image. Two very different readings, united by a fundamental belief: the way in which parents raise their children plays a decisive role.
The research team tried to remove some of the fog from this belief. The problem, in psychology, is always the same: parents and children share home, habits, family climate, money, rules, discussions, expectations. And they also share part of the genetic heritage. Separating these levels is as complicated as understanding, after years, whether a certain fear was born from a phrase said at the table or from something we already carried inside us, long before we knew how to give it a name.
To do so, the researchers used data from the German TwinLife project, a large study of twins and families. The final sample included 6,715 people: 2,639 twins, 619 non-twin siblings, 1,828 mothers, 1,390 fathers, and 239 partners or spouses of the twins. It is a valuable structure because it allows you to compare relatives with different degrees of genetic similarity: identical twins, fraternal twins, common siblings, parents, children, couples.
Participants were given standardized psychological questionnaires. For adolescents and adults, different scales were used, suitable for age: in the youngest there were items related to perceived leadership, feeling special, the ability to control others; in adults, desire for admiration, attention, prestige and status were measured. The main cohorts involved people aged around 15, 21 and 27, therefore a trait observed from late adolescence until full entry into adulthood.
The clearest result is the one that will cause the most discussion: approximately 50% of individual differences in narcissism have been attributed to genetic factors, while the other half depends on individual environmental experiences, i.e. those experienced by a person in a specific way. Friends, romantic relationships, school, university, work, successes, rejections, social rewards, status dynamics. The shared family environment, which should make brothers and sisters more similar because they grew up under the same roof, was found to be almost irrelevant.
This is the part that scratches common sense the most. The parents and children showed similar levels of narcissism, so the family resemblance was there. The statistical model, however, traced it back to shared biology, not to direct educational transmission. Put very simply: the child of a parent with narcissistic traits may resemble him, but the study suggests that that similarity comes mainly from DNA and much less from the parent’s daily behaviors.
The old guilty parent script falters
The research does not magically absolve all the families in the world, and it would be naive to read it that way. A parent can hurt, invade, devalue, humiliate, burden a child with expectations. All this leaves its mark. The study says something more precise and more uncomfortable: when you look at narcissism as a measurable trait, differences between people seem to be explained much more by genetics and unique personal experiences than by shared family climate.
There is also a curious detail. A small indication has appeared in the mathematical models in the opposite direction to the most popular idea: the most narcissistic parents, through their behavior, would even seem to create a slightly discouraging environment for the development of the same trait in their children. The researchers urge caution, because it is a delicate result and should not be transformed into a slogan. However, it is enough to significantly weaken the simple textbook phrase: narcissistic parent, narcissistic child by imitation.
Another element concerns the choice of partner. The study found signs of assortative mating, that is, the tendency to choose partners with characteristics similar to one’s own. In practice, parents tended to have more similar levels of narcissism to each other. This also contrasts with a very widespread cultural image, that of the highly narcissistic person who would always choose a submissive, weak partner, almost made on purpose to be dominated. The data suggests a less theatrical picture: like often recognizes like, even when the result at home becomes a small cold war with matching curtains.
The relative weight of genetics and individual experiences remained fairly stable at the different ages observed. The authors perhaps expected a growth in the genetic component in young adults, because with age, autonomy, personal choices and environments tailor-made around one’s inclinations increase. The data, however, did not show statistically robust differences between the cohorts. Between adolescence and early adulthood the general distribution remains similar: a strong biological part, an equally strong personal environmental part, very little space for the environment shared in the family.
This doesn’t make narcissism a fate written in permanent marker on your birth certificate. Genetics, in studies of this type, indicates a share of differences between people in a population, not a verdict on the single individual sitting in front of us. Having a predisposition means having a sensitivity, a tendency, a terrain. Then come the experiences, and there the matter gets dirty with real life: the peer group, popularity, first loves, humiliations, work, promotions, the way in which a person learns to receive attention and demand it.
Friends, loves, work
The direction indicated by the authors is very concrete. If the shared family environment explains little, research must look more carefully at what happens outside the home. A person with a certain predisposition can seek environments that confirm it, can obtain social rewards precisely when he behaves in a dominant, seductive, competitive, brilliant way. If every time she raises her voice she is listened to, if every time she occupies the stage she receives applause, if every time she uses charm she gets advantages, that tendency can become habit, then style, then identity.
Romantic relationships are a perfect laboratory, unfortunately. Some narcissistic traits may seem magnetic at first: confidence, intensity, ability to take over the room, big words, big promises, big gestures. First impressions can work very well. The bill comes when reciprocity asks for space, when the other stops being public and becomes a person, with needs, boundaries, tiredness, bad days. There the trait that seemed like charisma can begin to scratch.
Work matters too. In certain environments the search for status is rewarded almost automatically. Those who sell themselves better, those who take up more space, those who transform every meeting into a small stage can get more attention, more advancement, more recognition. There is no need to imagine scenarios from an American film with skyscrapers and sharks in jackets. All it takes is a company chat, an office, a project group, a boss who mistakes arrogance for leadership. The personality also trains like this, repetition after repetition.
On a biological level, many empty boxes remain. The authors suggest better investigating which genetic mechanisms are involved, including possible links to hormones such as testosterone and to brain systems that process rewards, threats and status signals. It’s still a long road, because saying “genetics” opens a door, of course, but behind that door there are circuits, sensitivities, contexts, reactions and years of life lived.
The research also has an important limitation: the data comes from self-compiled questionnaires. With narcissism this detail weighs heavily, because self-perception can be distorted, embellished, minimized. The authors report that these biases can artificially reduce the estimated family resemblance, and therefore partially modify the proportions between heredity and individual environment. The main conclusion, however, remains stable: narcissism tends to run in families especially through genetics.
The practical consequence also concerns psychologists, therapists, teachers and companies. Always looking for the cause in your living room risks losing huge pieces of history. It is worth looking at how a person is rewarded, chosen, feared, desired, imitated. Which environments allow it to grow without encountering limits. What relationships teach her that the attention of others is an acquired right. To what wounds, of course, but also to what advantages.
Narcissism remains a slippery subject, because people like to mention it too much. It’s become a quick etiquette, good for ex-partners, insufferable bosses, theatrical relatives, and people who take up all the air in the room. This study asks for something less comfortable: to lower the pointing finger, take a closer look at the data, stop reducing everything to the tale of the spoiled or neglected child. The family remains in the background. Blood weighs. The rest is done by the streets, the people, the prizes, the waste, the rooms where someone learns that the world must turn around when he enters. And sometimes, unfortunately, the world really turns around.
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