Researchers hope their findings will be used to improve the lives of young males for the long-term through parents fostering good relationships between their own children.
Brigham Young University in Utah, US, where the study was conducted "Having a sibling you can count on seems to make a difference especially for pro-social behaviour," said fellow professor Jim Harper.
"Best friends make a contribution, but siblings still matter."
However, the study also found that boys with a hostile relationship with a sibling were much more likely to have behavioural problems later on in life.
Even though absence of conflict between children can seem harmonious, it does not signify the presence of affection in the family.
Researchers claim that sibling rivalry and fighting is acceptable if parents help them discuss the situation and develop positive interactions.
- Independent