The cases that will be presented in this study are a mother having the control obsession who is 36 years old; and the son of this mother who is 12 years old with the symptom of tidines. Since they have applied for psychotherapy, at the start of the process, the projective techniques of Rorschach, TAT and Fairy Tales Test were carried out with both the mother and the boy. The mother came out to give a test protocol with a more or less clear borderline functioning where the obsessions were used as defenses. The son showed some signs of borderline processess; but in any case, the result pointed out an obsessional structure. The common things within the protocols were depressive symptoms, use of similar defense mechanisms and the existence of aggression. Repression was not enough for both of them regarding the outburst of aggressive feeling. The aim of all those projective material was to analyse the psychical processess and help the patients to plan a regular treatment with the medication if necessary. The findings are discussed according to French school of interpretation based on the psychoanalytic theory in order to give a detailed explanation of personality and discuss about the continuing psychotherapeutic intervention both for the mother and the son.