Objectives: This case study explored the client’s interpersonal conflict and the family characteristics affecting it. It also examined the family therapy interventions used and the changes in the family that resulted from the counseling. Methods: Constant comparative analysis and open coding were used to analyze the data. Results: The study revealed that the client’s interpersonal conflict was related to her family members, peer group, and teachers. Family-related influences included negative feelings among family members, dysfunctional communication patterns, the parents’ family-of-origin communication patterns and experiences, and the parents’ negative rearing practices. Effective therapeutic interventions included formation of a therapeutic alliance, reflection on repeated dysfunctional communication patterns, the guidance of communication skills, the demand for change in the parents’ rearing attitudes, the sharing of similar cases, and the therapist’s self-disclosure. Conclusions: As a result of therapist’s interventions, the family adopted new, functional communication methods and changed their relationships with each other.