American psychologists surprisingly concluded that our aggressiveness depends on having or nor having brothers and sisters and the sequence at which they were born, PLOS one magazine reports.
The scientists studied more than 450 families with kids of different ages and found that boys who have an older brother were the most aggressive. However, girls who have older brothers were just a bit less aggressive.
On the other hand, kids who have younger siblings exhibited less aggression, calmness and peacefulness. Kids who have both older and younger siblings showed moderate level of aggression. Researchers also pointed out younger kids are likely to grow into aggressive adults if their older siblings were aggressive.
Source of the image: Photl.com.