INTRODUCTION: Chronic mental diseases are enduring and recurring, and need constant care and a collaborative approach for management. Based on clinical guidelines, family interventions can improve the quality of care for individuals with chronic mental diseases. OBJECTIVE: Specifically, the study examined family involvement in the care of people suffering from schizophrenia, major depressive disorder, and bipolar mood disorder by adapting international clinical guidelines. METHODS: The resource toolkit for guideline adaptation was selected as the adaptation process. Seven databases were searched for international clinical guidelines. Independent reviewers utilized the Appraisal of guidelines for research and evaluation II tools to assess guidelines that met the inclusion and quality criteria. The recommendations from the guidelines were combined with those from the systematic review and qualitative research, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses and COnsolidated criteria for REporting Qualitative research checklists. Rephrased recommendations with redundant or overlapping content were excluded from the Iranian context due to the cultural, religious and belief changes of the people, as well as the lack of necessary facilities. Translations of the selected recommendations were made into Persian, along with modified recommendations. RESULTS: A total of 573 recommendations from 17 books, 10 national documents, 16 guidelines, 27 articles, and 31 English and Persian theses were identified. After the initial review (referred to as RAND/UCLA Appropriateness Method 1), 467 recommendations received an appropriate score, 106 had an uncertain score, and none of them received an inappropriate score. After merging the recommendations, they received 433 good grades and 98 uncertain grades. After the face-to-face meeting of the research team, 7 were merged due to similarity, and 91 recommendations were made in a hybrid panel of experts (RAND/UCLA Appropriateness Method 2). Finally, 524 recommendations were identified that applied to the psychiatric medical centers in Iran. The examined and revised recommendations suggest healthcare professional interventions for family involvement in the care of patients with schizophrenia, major depressive disorder, and bipolar mood disorder referred to medical centers in Iran. The adapted recommendations emphasize the need for family-centered collaborative care ( interventions which satisfy the needs of patients with chronic mental diseases and their caregivers, considering their preferences and capabilities.