This study focuses on the emergent conversational styles in the interaction between therapists and clients in a context of a first session of family therapy from a theoretical point-of-view which aims at integrating the institutional and interactional orders of discourse. It was possible to observe that the therapy session presents a hybrid discursive configuration, displaying the characteristics from both institutional and ordinary talk, which is evidenced by the nature of the conversational floor - at times configuring itself as expert talk, at times structuring itself as spontaneous talk -observed throughout the interaction between therapists and clients. Therefore, by articulating the concepts of institutional order and interactional order, we argue that these instances of talk-in-interaction, characterized as ordinary talk, are contextually relevant for the accomplishment of the institutional mandate peculiar to family therapy and not deviations from the institutional organization.