Although pharmacological treatments can help alleviate mood symptoms in youth with paediatric bipolar disorder (PBD), residual symptoms still commonly persist. In many cases, these symptoms seriously affect the social and psychological development of children and adolescents suffering from PBD. Complementary interventions, such as psychosocial and psychoeducational treatments, can help children and their families manage mood regulation and other challenges throughout childhood and adolescence. However, most research on such interventions has focused on children, single-family psychoeducation, and individual cognitive behavioural therapy. The present study, conducted in Sweden, used a case-series design to explore whether child- and family-focused cognitive behavioural therapy (CFF-CBT) for PBD, adapted from children (8–12 years) to adolescents (13–18 years) and applied in a multi-family format, could help reduce symptoms, improve psychosocial functioning, increase parents' knowledge of and skills for coping with the disorder, and improve family expressed emotion for adolescents with PBD. Login using your SSSFT NHS OpenAthens for full text. SSOTP - You can request a copy of this article by replying to this email. Please ensure you are clear which article you are requesting.