A family environment with sisters not only leaves a mark in childhood: it also shapes men to be emotionally available, less competitive, and more empathetic in their relationships, as studies reveal.

Is there a formula to be a better partner in adult life? Science points towards an unexpected answer: growing up alongside a sister.

According to a study from the University of Ulster, led by Professor Tony Cassidy, young people who grow up with sisters tend to develop greater positivity, sociability, and emotional balance.

The analysis focused on the mental health of 571 people aged 17 to 25, where it was found that sisters promote communication and family cohesion, key elements for emotional well-being throughout life.

Less competition and more empathy

On the other hand, the University of Okayama, under the direction of Professor Hiroko Okudaira, investigated how the presence of sisters influences male behavior in the face of competition.

In activities such as mazes and math tests, it was observed that men with sisters preferred to avoid competition and opted for more collaborative strategies, suggesting a direct impact on their style of emotional relationship: more empathy, less need to dominate, and greater ability to emotionally share.

Men who know how to love better

These men, in addition, tend to be more familiar with women’s emotional needs, are not afraid to show affection or talk about their emotions, and possess a greater emotional responsibility.

Growing up with a sister not only shapes good siblings, but also better partners. If you have ever wondered if the family environment influences how men love, the answer is in science: yes, and sisters play a key role.

So, if your guy grew up surrounded by dolls, secrets, and late-night chats with his sister, he probably has everything he needs to build a strong, healthy, and emotionally present relationship.

Studies have shown that men who grow up with sisters are more collaborative and loving in relationships