Bullying does not just take place at school.   It happens at home as well.   This goes beyond sibling rivalry and involves one sibling persistently and intentionally xxx. This can be just as serious as bullying that occurs at school and can contribute to your child becoming either a bullying victim or a bully at school.  Research shows that when parents spend more quality leisure time with their children and less time arguing with them, the siblings are less likely to bully each other.