This article is the result of the research called “Aggressiveness in children. A perspective from dynamic psychology, family and critical pedagogy” conducted by the Luis Amigo University Foundation in 2010. This research used a qualitative methodology having some hermeneutical scopes. The objective was the interdisciplinary understanding of the aggressive behavior of children aged between 7 and 10 years attending a school in a suburb of Medellin city, Colombia. This paper presents the results of the psychological component of the project. In order to get the information it was applied the Thematic Apperception Test for Children (CAT) and the family drawing test. For the analysis it was used a hermeneutical method of discourse analysis, not the protocols of such test. The sample consisted of 11 children who showed aggressive behavior and 10 who had regular behavior, which served as control group. As a result, it was found that the fundamental differences between both groups of children were focused on self-states, character traits, the structure of superego and the Oedipus conflict.