The article introduces a research that examined the impact of family on the cooperation of individual family members in family-owned businesses by applying a theoretical framework based on family therapy, family business research and social value research. Firstly, it presents a model based on blending family therapy and social research on the individual’s value preferences with the aim of exploring the internal structure of this family effect. It also shows a possible family business consulting method in order to observe and handle the dynamics of this internal structure. Then, testing of the described model and consulting method is conducted by multiple-embedded case study research. Based on the results, refining statements are formulated regarding the applicability of family therapy in family business consulting and social value research.