What is traditionally called individual, family and community care are elements of the same reality and cannot be separated. The genogram is an instrument or tool of the biopsychosocial model that gives information about the patient, their family and context, and that implies a prognostic value and useful information for the consultation. The biomedical family history means collecting problems of genetic transmission, but from the biopsychosocial point of view it can go much further: the elaboration of the genogram produces a therapeutic link with the family, implying a qualitative change in the relationship; the genogram gives rise hypotheses -in circular terms-about patients' risks for family related illnesses or stressors, such as diabetes, hypertension, coronary heart disease, substance abuse, and depression; It allows developing a provisional explanation about how the family system is organized around a problem; genogram shows events of family life, transitions and turning points, that mean opportunistic prevention and treatment moments. "Complex" genograms present families with psychosocial problems that can be expressed like biomedical problems. The genogram can be used as a screening system in all patients, at their first glance, regardless of the problem that motivates their consultation, to identify biological or psychosocial problems that would manifest themselves later. It is advisable to make "feasible" genograms avoiding excessive information that paralyzes understanding and intervention. The genograms are a fixed photograph of the family at a certain moment, and the concept of "chronogram" should be incorporated (evolution of the same genogram after the time).