The purpose of the present research is to explain the role of competitiveness in predicting the level of aggression among young people with the mediating role of family interactions. In order to measure competitiveness, the standard questionnaire of Maxwell and Morris (2007) was used, for aggression, the questionnaire of Bass and Perry (1992) was used, and finally, to measure the mediating role of family interactions, the 10-question questionnaire of David Elson and Howard Barres (1985) was used. has been The validity and reliability of this questionnaire has been confirmed in this and similar researches. The results of the research show that all the sub-hypotheses of the research along with the first main hypothesis are confirmed with 95% confidence according to the significance level lower than 0.05; Therefore, according to the results of this research, there is a difference between the role of competition in the dimensions of satisfaction resulting from achieving better performance, desire to win, motivation to try, feeling satisfied with doing tasks correctly and preferring to do more difficult tasks by predicting the level of aggression. There is a significant relationship between young people. Healthy competition, if it is on its way, can prevent the occurrence of aggression among adolescent boys, and family interactions have not been able to reduce or moderate the aggression created during competition.