Sibling Violence and Position in Sibling Dyad in a Sample of Adolescents: How Does It Relate to Self-Esteem?

(1) Background: Research regarding sibling violence is still scarce, although it is the most common type of intrafamily violence. Every sibling's position in the sibling dyad seems to influence this type of violent conduct since every status has its characteristics. Siblings involved in aggressive behavior seem to be described as having low self-esteem. This study intends to test the predictive effect of self-esteem, sibling position and sex on sibling violence development. (2) Method: The sample consists of 286 students, aged between 12 and 17 years, from both sexes. A social demographic questionnaire and the Revised Conflict Tactics Scales-the Portuguese Sibling Version (CTS2-SP) and the Rosenberg Self-Esteem Scale were used for data collection. (3) Results: The results show an association between self-esteem in sibling violence, as well as an association between sibling position on negotiation and sexual coercion's perpetration and victimization. Sex also predicts the negotiation of psychological aggression's perpetration and psychological and physical aggression's victimization. (4) Discussion: the results will be discussed according to the attachment theory, considering the importance of affective bonds with siblings as adaptive development facilitators.