This paper describes a multi-family therapy (MFT) group for adult outpatients with obsessive-compulsive disorder and their family members. Since family accommodation (FA) is known to maintain OCD symptoms by preventing exposure and response prevention (ERP), reduction of FA is a major focus of the treatment. Furthermore, psychoeducation, conjoint ERP and (re)discovering resources and strengths of families are also important therapeutic foci of the family group. The organisation of MFT is explained and involvement of family is illustrated with clinical vignettes. Finally, some reflections about MFT are provided. On the basis of initial clinical impressions, MFT seems a promising approach. A clinical trial is currently underway.