The encounter with the other person imposes on us a complex psychic work. For the par-ents this work of transformation begins with the birth of the child who confronts them with the topic of extraneousness and which is then renewed in the period of adolescence. In this work the author questions the role of confrontation with otherness as a constitutive element of the transition to puberty. This aspect is observed, presenting the clinical material concerning an adoptive family with two teenage children. For adoptive families this passage is articulated through various vicissitudes in which evolutionary phenomena and traumatic expe-riences are intertwined, which make the work itself of psychic elaboration very delicate and complex for the entire family. In this paper the theoretical point of view, from which to ob-serve these delicate passages, is the interpersonal one that deals not only with intrapsychic processes but also with the relationships and interactions that surround the subjects.
Keywords: Adoption, family therapy, adolescence, intersubjective, stranger.