The aim of the study has been to see if parent- youth relations have an impact on teenagers bullying behaviour and whether we can find any differences between boys and girls. To study this field we have used a quantitative approach using materials from Stockholmsenkäten 2014. In order to analyse the material we have used cross tables, indexes and multivariate cross tables analysis with associated significance test. In this study the attachment theory has been used. The results indicate that parent- youth relations seems to have an impact on teenagers bullying behaviour. The teenagers who bully others are more likely to have a bad parent- youth relations characterized by an insecure attachment to their parents. The opposite tends to apply for those who do not expose others to bullying, these teenagers usually have a good parent- youth relations where they have a secure attachment to their parents. Furthermore the result also indicate that the nature of the parent- youth relations along with if the adolescents expose others to bullying did not differ between boys and girls.