This review updates previous similar papers published in JFT in 2000, 2009 and 2014. It presents evidence from meta‐analyses, systematic literature reviews, narrative literature reviews and controlled trials for the effectiveness of systemic interventions for families of children and adolescents with common mental health problems and other difficulties. In this context, systemic interventions include both family therapy and other family‐based approaches such as parent training, or parent implemented behavioural programmes. The evidence supports the effectiveness of systemic interventions either alone or as part of multimodal programmes for sleep, feeding and attachment problems in infancy; recovery from child abuse and neglect; conduct problems, emotional problems, eating disorders, somatic problems, and first episode psychosis.. To read the full article, log in using your NHS Athens details. To access full-text: click “Log in/Register” (top right hand side). Click ‘Institutional Login’ then select 'OpenAthens Federation', then ‘NHS England’. Enter your Athens details to view the article.