A successor has the credentials, the industry knowledge, and years inside the business. Yet when the company must make a bold bet, they hesitate.
One sibling wants to resolve a disagreement immediately. Another goes quiet, thinks for two days, and returns with a carefully reasoned position.
One family member comes alive in front of clients, employees, and a board. Another is equally capable but contributes best through analysis, operations, or one-to-one relationships.
What separates these three people is not simply training, title, or effort. Personality, the relatively stable ways each person tends to think, feel, and respond to the world around them, may be part of the difference, alongside experience, role expectations, relationships, and context.
Families usually have explanations for these differences: upbringing, education, birth order, generation, the founder's influence, the roles people were given growing up, or simply who they took after.
Underneath these explanations sits one of the oldest questions in the study of human behavior: What comes from nature, and what comes from nurture?
For enterprising families, this is not an abstract debate. These assumptions eventually shape succession, leadership, ownership, and who gets trusted with what. They also shape something more personal: the stories families tell about one another.
The responsible one. The entrepreneur. The peacemaker. The difficult one. The one who is not a leader.
A new study, among the largest genetic studies of personality to date, gives us a sharper basis for thinking about where some of these differences come from. It also gives us a reason to be more careful with the labels families reach for.
Before getting to that study, it helps to have a shared vocabulary. Researchers who study personality generally organize it into five broad dimensions, known by the acronym OCEAN
The Five Traits OCEAN
Openness reflects curiosity, imagination, and comfort with new ideas. People higher in openness often appear exploratory, inventive, intellectually curious, and comfortable with ambiguity. Those lower in openness may be more practical, conventional, and inclined toward familiarity and proven approaches.
Conscientiousness concerns self-regulation, reliability, organization, and persistence. Higher conscientiousness is often associated with being prepared, dependable, disciplined, and attentive to detail. Lower conscientiousness may show up as greater spontaneity and flexibility, less preference for structure, or a tendency to procrastinate.
Extraversion describes sociability, assertiveness, outward energy, and a desire for stimulation. People higher in extraversion may be outgoing, talkative, and energized by activity and social engagement. Those lower in extraversion are often more reserved and reflective and may need less social stimulation. This does not necessarily mean they are shy or less capable socially.
Agreeableness reflects cooperation, empathy, trust, and concern for others. Higher agreeableness can look like warmth, accommodation, compassion, and collaboration. Lower agreeableness can look like skepticism, competitiveness, directness, and a greater willingness to challenge others.
Neuroticism refers to a tendency to experience distress and emotional reactivity. People higher on this dimension may be more sensitive to worry, frustration, self-doubt, and stress. Those lower on it tend to be calmer and more emotionally steady under pressure.
These are not five types of people.
Personality does not, on its own, tell a family who should lead. Research does show that certain traits are associated, on average, with leadership emergence and effectiveness, particularly extraversion, conscientiousness, openness, and emotional stability. But these are tendencies, not selection rules. Their value depends on the role, the organization's next challenge, the culture, and the strengths of the team around the leader.
Family business research on personality is still young, but two recent studies suggest why it deserves more attention.
A small study of managers in Ecuadorian firms found that openness was associated with lower reported workplace conflict (Guerrero Calle et al., 2024). It also reported differences in relationship conflict between family and non-family business contexts.
A second study, involving 124 descendant entrepreneurs in small retail family businesses in Pakistan, found that higher self-reported openness, conscientiousness, extraversion, and agreeableness were associated with higher self-reported succession success (Ahmad, Chan, & Oon, 2023). Neuroticism had no statistically significant direct association in the authors' model, although the study reported a negative indirect pathway through perceived value congruence.
Both studies are small, survey-based, cross-sectional, and specific to particular countries and sectors. They cannot establish that personality causes conflict patterns or succession outcomes, and they do not show that one personality profile makes someone a better successor.
Together, however, they suggest that personality may be relevant to how people experience conflict and evaluate succession in family enterprise settings.
Then came a study of an entirely different order of magnitude.
Published in Nature in September 2026, it combined genetic and personality data from 46 cohorts, involving between 611,037 and 1.14 million participants depending on the trait, as well as within-family analyses.
It is worth saying plainly: this study is not about family businesses. It does not directly address succession, conflict, or leadership.
What it offers enterprising families is something more fundamental: a clearer picture of the contribution that common, measured genetic variants make to differences in personality traits across large populations.
Here is the finding, stated plainly.
Across more than a million people, common genetic variants that researchers can currently measure accounted for roughly 5 to 9 percent of the variation in each personality trait. That figure rose to roughly 9 to 13 percent after accounting for the imperfect reliability of personality questionnaires. No questionnaire captures a trait perfectly. A person's answers can shift somewhat with mood, context, or how they interpret a question.
The genetic signal is real, but it is only one part of the picture.
What remains unexplained cannot simply be called "environment." It includes life experience and social context, certainly, but also genetic influences that current methods do not capture well, measurement limits, and the ways genes and environments shape one another over time.
The study therefore does not offer a final accounting of what portion of personality comes from genes and what portion comes from environment.
The researchers then asked a narrower but important question: might the genetic signal be largely an artifact of family-level confounding, with parents passing on both genes and a shared environment?
In within-family analyses, relatives who shared much of their family background but differed in inherited genetic variants still showed corresponding personality differences. The results suggest that the detected genetic associations are not explained away by shared family environment.
They do not imply that family environment is unimportant, that siblings experience identical upbringings, or that genes determine what any individual person will become.
This is where enterprising families are not like other families.
Most households do not hand a child real responsibility at a young age, put them in front of employees and a board, measure them against siblings sharing the same inheritance, or attach a public reputation and an economic stake to who they turn out to be.
Enterprising families often do all of this, sometimes starting in adolescence, sometimes for decades.
That intensity does not create personality from nothing. But it may make family patterns especially consequential in shaping how tendencies are expressed, interpreted, rewarded, and remembered.
Which brings the argument back to where it started.
One child becomes the responsible one. Another becomes the visionary, the peacemaker, or the problem.
Some of these descriptions may capture something enduring about a person's disposition. Others may reflect a role the family assigned and then reinforced, long after the child who first fit it grew into someone else.
In practice, these possibilities are difficult to disentangle, especially within one family, where dispositions, relationships, expectations, and opportunities have developed together over years.
That is precisely why labels deserve scrutiny.
"Cautious" can become "not entrepreneurial enough."
"Direct" can become "aggressive."
"Quiet" can become "not leadership material."
Once these labels settle into a family, they can follow someone for years, narrowing what a person is invited to become before anyone has tested what they are actually capable of.
What This Means in Practice
In succession, separate capability, personality, and fit. They are related, but they are not the same thing.
A capable successor may not fit a particular role at a particular moment. A quieter style can be highly effective in a role built on judgment, analysis, or relationship depth rather than visibility.
The more useful question is not whether a successor resembles the founder. It is what the next chapter of the business actually requires.
Once you look at personality this way, the more useful question is often not simply who should lead, but what mix of tendencies a particular moment calls for, and how different family members might complement one another rather than compete to fit the same mold.
One person may see opportunity first, another risk. One may build relationships easily, another may bring discipline and follow-through.
Designing roles, leadership teams, and family councils around complementary strengths can be more realistic than searching for the one person who supposedly has everything.
In how the family talks about itself, treat every settled description of a person as a hypothesis, not a verdict.
Ask what evidence actually supports it. Ask whether the family would still describe that person the same way if the circumstances that produced the label changed.
This matters most in next-generation development.
Personality assessments, and certainly genetic information, should not be used to screen relatives for leadership, ownership, or succession. Group-level patterns from large population studies cannot determine what one specific person, raised inside one specific family, is capable of becoming.
What Runs in the Family
What runs in the family is not only DNA.
It may be a pattern of risk-taking or caution, a story about sacrifice, a founder's model of authority, or a belief about who deserves influence.
Some dispositions have biological influences. Family systems, alongside schools, peers, culture, opportunities, and individual agency, can also shape how tendencies are expressed, interpreted, encouraged, or discouraged.
The new research does not resolve nature versus nurture by declaring a winner.
It shows that common genetic variation makes a real but modest contribution to differences in measured personality traits. It does not fully partition personality into genetic and environmental causes, nor can it identify what any one family environment has caused in any one person.
No family chooses a child's initial dispositions or sensitivities.
But families can influence, often without noticing, whether a tendency is given room to develop, constrained, encouraged, or interpreted as a strength or a liability. Those choices, and the opportunities, roles, and stories that accompany them, can matter over decades.
The task is not to identify the personality most likely to succeed.
It is to understand the people already inside the system well enough to make better choices about roles, relationships, and development, and to hold the stories the family tells about one another a little more loosely than it does today.
Questions for Reflection
Which descriptions of family members have become fixed labels, and what evidence actually supports them?
When you evaluate a successor, are you measuring fit for what comes next, or resemblance to the founder, which may reflect both disposition and family expectations?
When you evaluate a future leader, do you distinguish between capability, personality, and fit?
What leadership does the enterprise need now, and what will it need next?
Research Cited
Guerrero Calle, M. B., Bollen, K., Sucozhañay, D., & Euwema, M. (2024). "The impact of managers' personality on task and relationship conflict: The moderating role of family and non-family business status." Journal of Family Business Strategy, 15, 100606. https://doi.org/10.1016/j.jfbs.2024.100606.
Ahmad, Z., Chan, W. M., & Oon, E. Y. N. (2023). "Does congruence between a descendant entrepreneur's personality traits and family business values matter for succession?" Frontiers in Psychology, 14, 1043270. https://doi.org/10.3389/fpsyg.2023.1043270
Schwaba, T., Clapp Sullivan, M. L., Akingbuwa, W. A., Ilves, K., Tanksley, P. T., et al., Nivard, M. G., & Tucker-Drob, E. M. (2026). "Robust inference and correlates from genetic associations with personality." Nature. https://doi.org/10.1038/s41586-026-10992-9