This paper presents an analysis of how three interlocutors sequentially organize and accomplish mutual understanding in naturally occurring audiovisual recordings of therapy sessions. The analysis is in keeping with microanalysis of face-to-face dialog (MFD) and follows operational definitions of three-step micro-processes that interlocutors use when they calibrate new information; that is, how they agree that they have understood each other's words and actions well enough for current practical purposes. Pointing to some of the complexities that characterize triadic interactions, the analysis contributes with new documentations of 'suspended', 'nested', 'branched', 'multi-paced', and 'mixed interpretations' calibrations. The analysis also demonstrates how interlocutors may calibrate the 'tone' of an utterance before the topical content is mutually understood. The results and their implications may be relevant to practitioners of institutional talks at large, where the quality and outcome of, for instance, assessments and interventions largely rely on accomplishing mutual understanding.