Some Psychopathologic problems occurring during childhood in twins are discussed from the point of view of mental health. On the basis of case history of twins affected by neurologic or psychiatric disorders some typical situations have been examined: (1) Psychopathologic problems arising from perinatal death of the cotwin; (2) Psychopathologic problems arising from the death of the cotwin during late childhood; (3) Psychopathologic problems arising in the pair from organic or neuropsychaitric

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... vent in one of the twins; (4) Psychopathologic problems of the twins due to disorders of personal identity and the interaction between the twins. The cases are analyzed from a psychodynamic point of view, in relation to the development of personality in the twins, and from a psychosocial point of view, in relation to the cultural stereotype of the twins during the socialization process and in the context of parental dynamics.