Whether someone grows up to be narcissistic has far more to do with the genes they were born with than the way their parents raised them, according to a large new study published in Social Psychological and Personality Science. The findings challenge decades of popular wisdom that blamed overindulgent or cold parenting for producing narcissistic personalities, and suggest that researchers and clinicians have been looking in the wrong place for answers.
The study, conducted by researchers at the Universities of Münster, Bielefeld, and Bremen in Germany, analysed narcissism data from more than 6,700 people drawn from the German TwinLife project. This extended twin family study included identical and non-identical twins across three age groups, along with their parents and non-twin siblings, making it one of the most comprehensive investigations into the genetic and environmental origins of narcissism ever conducted.
Narcissism as a personality trait is associated with grandiosity, a strong sense of entitlement, and a drive for social status. It has been linked to both positive outcomes, such as confidence and leadership attainment, and negative ones, including relationship conflict and poor decision-making. Because it tends to be observable from childhood and remains relatively stable into adulthood, understanding where it comes from carries real practical significance.
The researchers found that genetics and individual-specific environmental factors each accounted for around 50% of the variation in narcissism scores across all age groups and measurement tools. Crucially, environmental influences shared within families, such as a common household, the same parenting style, or shared socioeconomic background, contributed virtually nothing to the differences observed between individuals.
Parents and children were indeed similar in their narcissism levels, but the analysis showed this family resemblance was entirely explained by shared genetics rather than shared upbringing. More narcissistic parents did not appear to produce more narcissistic children through their behaviour or parenting approach. If anything, the data suggested that direct parental environmental transmission had a slightly negative effect, meaning that children of highly narcissistic parents tended to be marginally less narcissistic themselves via environmental routes.
The study also found evidence of positive assortative mating, meaning people with higher narcissism levels tended to pair with similarly narcissistic partners. This amplifies genetic transmission across generations and helps explain why narcissism clusters in families, though the researchers caution the effect is modest.
Rather than blaming parenting for the development of narcissistic traits, the researchers argue that future work should focus on individual-specific experiences that vary between siblings, such as peer relationships, romantic partnerships, and career trajectories. These non-shared environmental factors may shape how a genetic predisposition towards narcissism ultimately expresses itself over a lifetime.
The findings point to genetics as the primary driver of narcissism in families, calling for a fundamental rethink of how the trait is understood and treated in clinical and everyday contexts.