The Families Unit at the Cassel Hospital is the only medical establishment with in-patient beds for whole families, and it can provide the opportunity for detailed and relatively safe observation and treatment of severely disordered families. A number of different kinds of family are treated, including those in which a mother has suffered a severe post puerperal breakdown, those in which one or more members of the family have a severe psychiatric condition such as chronic depression, as well as families whose whole functioning in many aspects of life has broken down.