From the longitudinal cut of a child’s clinical case, we analyze the unfolding of the maternal and paternal function in the evolution of his psychic constitution, the implications in his development and how it evolves from a change in the positioning of both parents.The manifestations of the child’s play, the expression of his language, and the organization of the self from a metapsychological approach, are the sources for analyzing psychic development. At the same time, the impact of the arrival of the diagnosis of ASD, linked to that of disability, and its implications are also considered.