This paper deals with the unconscious symbiosis between a woman and her grown up son, which has been maintained for a long time although the son is already grown up. The son had been diagnosed as schizophrenic for quite some time. The mother attends group psychotherapy together with patients with different diagnoses. The son underwent intense inpatient psychotherapy but subsequently refused treatment in an ambulant therapy. Nevertheless he improved and took responsibility for his own life (profession, partnership) in the same measure as his mother used the group psychotherapy for herself, learned to experience her own suffering and initiated her own separation process. The author presents material from the mother's group psychotherapeutic process as well as the development of her dreams with additional dream reports and statements from her son with regard to specific interview questions. The author examines the hypothesis that there is a direct synergetic relation of unconscious processes between mother and son.