Family could be both a risk factor and a protective factor in the development of the child. Influence of the family, and especially parental influence, interact with child's personal characteristics and lead the child’s development to certain behaviours. Parental acts are significant predictors of numerous developmental outcomes and future child behaviours, so the aim of this paper is to investigate the role of parents in the emergence of aggressive behaviour of children and youth. Parenting styles, emotionality and parent's control are particularly important in the development of aggression. Violence against the child and partner violence undermine the trust and respect that child is supposed to have towards parents and they teach the child how to achieve goals using force, which can encourage his aggressive behaviour. Physical punishment and partner violence are essential for the emergence of aggression because the child learns those behaviours from his own family and transmits them to his surroundings. Neglect is also an important element because unwanted children don't know what love and support are so they can hardly develop those capacities, and because of that children can become cold and aggressive. Prevention and intervention have an important role in making the family aware of their role in development of aggressive behaviour of children and youth.