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In adolescence, the movement of disaffiliation can constitute a structuring element of subjective evolution and identity transformation followed by a path of maturation towards adulthood. However, in many of these cases of identity shift, the disaffiliation is abrupt, secret, involving a total denial of the parents’ values and the parents themselves. The factors that lead to family disaffiliation are multiple: fragility of the ego’s construction, failures in social structures and family functioning, primacy of values of performance and rapidity to the detriment of bonds. Based on the clinical situation of a reconstituted couple, the author seeks to analyse the effects of family factors, including the various unconscious alliances, that contribute to a marked identity transformation in one of the children (a girl). The latter, inclined towards religion and ideology, establishes a basis of narcissistic revalorisation and a chaos of transmission.