In India, an estimated 30% of the population suffers from some form of psychiatric disorder. Twenty million Indian families have at least one member suffering from schizophrenia. More than 12% of Indian children aged 1 – 16 years suffer from mental disorders and the incidence of mental retardation is also high. Severe mental disorders that include schizophrenia, bipolar disorders, organic psychosis and major depression affect nearly 2% of our population. Many epidemiological studies conducted in India on mental and behavioral disorders report varying prevalence rate, ranging from 9.5 to 370 per 1000 population. The study utilized an experimental research approach. The study was conducted in a mental hospital, Gwalior, M. P. A purposive sampling technique was utilized for selecting a sample of 50 family members of the 50 patients with CMD in mental hospital, Gwalior, M. P. A structured interview schedule with multiple choice question and STM was prepared. Content validity of the tool was established by 6 experts in the field of psychiatric nursing. Data collected were analyzed and interpreted by using descriptive and inferential statistics. Prior to the implementation of STM the family members had mean percentage 39.89% of total score, which is poor knowledge, whereas after the implementation of STM the family members had mean percentage 72.97% of total score which is good knowledge with the effectiveness of 33.08%. The content of the STM will help the nursing professionals in hospital and community to reinforcing their knowledge on home care management of the patients with CMD and it's also helpful to improve the knowledge of family members of the patient with CMD regarding CMD.