Adolescents' tendency toward social harms is one of the important individual and social issues that is shaped under the influence of a set of family, psychological, social, and educational factors. The family, as the first and most important institution of socialization, can play a protective role against social harms by providing a supportive and educational environment, and in conditions of dysfunction, it can become a risk factor. The present study was conducted with the aim of analyzing family factors influencing adolescents' tendency toward social harms with an integrated psychological, sociological, and educational approach. This research was qualitative in terms of approach and was based on thematic analysis in terms of method. Data were collected through semi-structured interviews with 16 participants who had experience and knowledge related to the field of adolescents, family, and social harms, and after several stages of review, coding, and categorization, main and sub-themes were extracted and organized. The findings of the study showed that family factors influencing adolescents' tendency toward social harms can be explained in three major domains: psychological factors, sociological factors, and educational factors. In the psychological dimension, the quality of attachment, emotional relationships, family conflicts, psychological support, and the emotional atmosphere of the family were important; in the sociological dimension, family cohesion, parental supervision, socio-economic conditions, family structure, and the extent of the family's connection with support and social networks were prominent; and in the educational dimension, parenting style, life skills training, transmission of values, responsibility, parental modeling behavior, and the quality of parent-adolescent communication were emphasized. The results showed that these factors do not operate independently, but rather within a dynamic system and in interaction with each other, they provide the ground for increasing or decreasing adolescents' vulnerability. Accordingly, effective prevention of adolescents' social harms requires simultaneous strengthening of the family's mental health, its cohesion