By combining the analysis of the interviews with those of video data recorded in a Mutual Assistance Group (Groupe d’Entraide Mutuelle, GEM) Envol et Cie in Villeurbanne, the article identifies and describes some configurations in situ that make it possible to problematize the building of peer relations, around the notions of “similarity”, “symmetry”, “parity”. The establishment of these relations are examined on the basis of how the participants position themselves vis-à-vis peers as well as non-peers (case of a meeting with a non peer facilitator).