This article examines the socio-psychological mechanisms through which adolescent egoism manifests within the family environment. The study is framed as a conceptual and methodological analysis based on developmental psychology, social psychology, and family psychology. Particular attention is paid to emotional climate, parenting style, family conflict, parental control, socio-economic status, digital socialization, empathy, self-esteem, and emotional security. The article argues that adolescent egoism should not be interpreted merely as an isolated personal trait. Rather, it is a dynamic phenomenon that emerges through the interaction of external family determinants and internal psychological mediators. The paper also proposes diagnostic and preventive directions for psychologists, teachers, and parents working with adolescents.