Objectives: The aim of the present study was to investigate the burden of minor relatives of schizophrenia patients and of the needs for support for the relatives. Methods: 135 relatives of patients with schizophrenia or schizoaffective disorders were assessed by using the "Involvement Evaluation Questionnaire" and the "Carers' Needs Assessment for Schizophrenia". Results: 24.4% of the total sample (N=33) had minor (i.e. below 18 years) siblings (N=18) or children (N=15). If the patient had minor siblings, almost the half of the adult relatives reported moderate or severe problems. However, among those patients who had to take care for minor children, only a fifth reported moderate or severe problems. Among the patients' offsprings being under the age of 16 behavioural disturbances, reduced appetite and other consequences of the disease were reported frequently. Conclusions: These results indicate that patients with schizophrenia or schizoaffective disorders often have minor relatives in their family frequently suffering from marked burden.