One of the Family follows Dorset County Council's fostering service over the course of a year to witness the intimate day-to-day work foster carers and other professionals do in helping the lives of children in care. Amy is 14 years old and has been living in foster homes since she was ten. Three months ago, she moved in with Steph and Chris and their family. It's her fourth placement in as many years, but as she enters her formative years she hopes it will be her last. Amy settles quickly and moves school to help become part of the family. But when her older sister Natalie moves in in an emergency, the placement becomes strained. Amy's behaviour deteriorates and foster carers Steph and Chris are forced to make a series of difficult decisions. With unprecedented access to the family, the fostering service and the social workers involved in the lives of Amy and Natalie, One of the Family explores the complex nature of fostering teenagers at a time of huge national shortage in carers. A disarmingly candid look at the intricate workings of a foster carer's home.