Hypertension is a persistent blood pressure where the systolic pressure is above 140 mmHg and diastolic pressure above 90 mmHg. One of the hypertensive treatments may use non-pharmacological therapy such as the management of a low-salt diet. Family is an important aspect in the care of sick family members. This is because the role of the family can prevent the occurrence of complications. One of effort that can be due is health education to increase knowledge. This study aims to provide family nursing care with a focus of knowledge deficit studies on management of hypertension using health education interventions. The method used in this research is descriptive method by using case study approach. Subjects in this study were two families suffering from hypertension. The results showed that there is an increase in knowledge on both clients and families about the management of hypertensive diet of the category less to be enough. This is evidenced by the increase in the value of questionnaires before and after being given health education. A suggestion in this research is for clients and families to start applying the knowledge they have.