Sibling aggression is common but can sometimes constitute bullying. A study found that almost a third of 3600 children reported being victims of sibling aggression in the past year, ranging from theft and psychological abuse to physical assault. While society often dismisses sibling rivalry as normal, researchers argue it can meet the definition of bullying as intentional, repeated acts of aggression where one sibling has power over the other. The article profiles one woman who believes her older brother bullied her and her siblings through wrestling matches where he would pin them to the floor, giving him a momentary sense of control during a chaotic time when their mother left due to depression.