This paper discusses the simultaneous psychotherapeutic work with a four-and-a-half-year-old autistic boy and his parents. The simultaneous psychotherapy was conducted by the same therapist who was at the time working at the Erica Foundation in Stockholm, Sweden. In particular, the paper focuses on the mutual influence between the work with the child and the work with the parents, as well as the impact of this model of work on the child’s treatment. Technical aspects of the simultaneous psychotherapies of the child and the parents are discussed.