To highlight the harmfulness and pervasive of early and repeated exposure to family violence from the theoretical perspective of complex trauma as a developmental disorder.A study carried out on a sample of 22 adolescents between the ages of 15 and 18, who have been entrusted to Il Faro Bologna, a Specialist Centre for child abuse and neglect. Specific areas of psychological functioning were examined. According to the NCTSN these areas are considered vulnerable to violence in primary relationships and crucial for future mental health. They are attachment, self-concept, affect regulation, cognition and behavioural control. The data was correlated with the different forms of maltreatment and the main risk factors detected in the family environment and was collected by means of clinical interviews, family and social histories, structured interviews and self-reports recommended by the NASMHPD.The data highlights a correlation between the psychic functions examined and exposure to family violence, distortion of parental empathy and parental responsibility failure.The study indicates the need: a) to raise clinical awareness of the consequences of complex trauma on development; b) to adopt specific diagnostic tools for evaluating post-traumatic outcomes; c) to carry out regular screening in order to explore histories of maltreatment in patients cared for by mental health services.