Many studies have highlighted the psychological impact and resulting vulnerability inherent in being second-generation immigrant (SGI) children. Some studies have also demonstrated that the symptoms of SGI adolescents can be the manifestations of traumas that have been unconsciously transmitted from one generation to another. The purpose of the research presented in this article is to investigate the different therapeutic processes and tools used by therapists during transcultural therapy to support conscious intergenerational and transgenerational transmission in their care of SGI adolescents and their participating family members. The monitoring of three patients, SGI adolescents, of different ages and origins, provided data that were analyzed using a clinical and transcultural qualitative method. The analysis of 10 sessions of transcultural psychotherapy with each SGI adolescent patient reveals, first of all, that this therapeutic device is illustrative in the care of SGI children suffering from the symptoms of inter- and transcultural transmissions of trauma. It also highlights various therapeutic levers and approaches to transcultural counseling that can enable families to consciously unveil their family and cultural histories. This research project also proposes a methodology where the inter- and transgenerational transmissions can be adapted to favor the healthy development of SGI adolescents identity and that can also be applied in other group or individual therapeutic devices.