The family is foundation where the human being grows to become what he is. The family members share job and pains they are all intertwined together and problems of anyone member influence the whole family system or cause difficulties on others in the system. Therefore we need to keep in mind that when we try to help one individual patient we need to understand the patient as a part of the whole. As of yet, it is hoped that there are more researches available in this area. This study aims to show that unless individual problem is perceived as a symptom of unbalance in the family dynamics, successful treatment would be difficult to achieve. The study will also attempt to relate this hypothesis to family theories in discussing effective intervention of nursing. The method of this research is done : in the following manner. 1. The related theories from literature have been reviewed in an attempt to analyse it`s potential effectiveness in practice of nursing. 2. The family systems theory of Minuchin has been examined to evaluate the appropriateness of it`s application to practice of nursing in the area of structured family treatment. A case study of a couple who suffer from unbalance in family system has been introduced to examplify a possible application of the Minuchin`s theory in effective intervention in family conflicts. A family has been utilized as a way of analysis of this study. A conclusion has been drawen : 1. The family theories reviewed in this study were General system theory, Structural theory, Commanication theory, Bowen theory, Behavior theory and Developmental theory. 2. The concepts of functional and dysfunctional families have been clarified in view of treatment goals. 3. The case study has been analysed with respect to Minuchin`s structural theory. It was been found that application of his theory has been effected in bringing about a positive result. (Based on the analysis of this study.) On intervention in nursing practice can be more effective if the practice is administered on the basis of relevant practice theory. The study suggests that more active researches on the applicability of varies family theories to treatment are desirable. Systematic training of professional nursing staff can be more effective. If there is better education of scientific knowledge in conjunction with practical knowledge.