The present study aims to discuss the place of the female adolescent in the intrafamilial sexual abuse dynamics, perpetrated by the father or his emotional representative. It is a qualitative research, carried out through the analysis of eight cases, from interdisciplinary reports developed by the technical team responsible for evaluating sexual abuse allegations and interviews given by these professionals. The field research resulting material was submitted to content analysis, based on its thematic modality. The results predominantly point to families in which the places of the constituents are built upon fragile boundaries, enabling the entanglement among family subsystems, aggravating conflictive or distant relationships between the adolescent and her mother, the initiation of the sexual abuse in the childhood phase and the maintenance of confidentiality for long period until adolescence.