The author studies the intra-family violences under the angle of the strong idealization-splitting hence induced by such violences. Such a splitting becomes an obstacle to the adolescent process, i.e. impinges the separation task at work from the family-group of childhood : with the individuation process, such violences attack the psychological exit from the family cell of the past. Such a problematics of confinement, of an internal prison which, underlined by the idealization-splitting, and locks in development, will be analyzed from the material of both a family- and an individual therapy. The author will analyze a specific form of idealization-splitting, i.e. the one which is at work with intellectual defence mechanisms.