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A discussion group for adolescent siblings of people with autism was set up from 2018 to 2021 at the Lorraine Autism Resources Centre in order to offer participants a space to share and listen to their feelings in a contained and safe setting. This article aims to determine the group processes that promote access to a subjectivation of disability in this type of setting. The analysis focuses on the effect of mirror games and alliances between participants in building a sense of belonging to the group, on the value of mediating objects in creating a transitional space to facilitate exchanges, and on the influence of the posture of the psychologists /facilitators in creating a group dynamic.