Family interventions in schizophrenia have shown positive effects on patients but little attention has been paid to their effects on family members, particularly those in non-Western countries. This multi-site randomized controlled trial evaluated the effectiveness of a bi-weekly, 12-session, family-led mutual support group for Chinese caregivers of schizophrenia sufferers over 36 months, compared with a family psychoeducation group program and standard psychiatric care. It was conducted with 114 families of outpatients with schizophrenia in Hong Kong of whom 38 were assigned randomly to a mutual support group, a psychoeducation group, or standard care. Families' psychosocial health status and patients' symptom severity and length of re-hospitalizations at recruitment, one-month, 18-month, and 36-month post-intervention were compared between groups.