<p>The main objective of this study was to analyze the influence of parental communication on the fraternal relationship. In this sense, an exploratory, quantitative and cross-sectional investigation was carried out, with a sample of 209 adolescents, with siblings, and a Sociobiographic Questionnaire, the Scale for Evaluating Communication in Parenting and the Brother-Sister Questionnaire were applied.The results showed that there is a positive association between parental communication and empathy and similarities in the fraternal relationship; that the expression of affection and emotional support, relative to the mother, positively predicts the maintenance of limits in the fraternal relationship; and metacommunication predicts negatively the maintenance of boundaries between siblings. Considering these results, it was proposed the implementation of a parental intervention/education program to work the communication skills of all elements of the family system.</p>