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As part of family psychoanalytic work, the therapist regularly meets with hateful emergencies, sometimes installed in diachrony, sometimes arising from an eruptive manner that surprises him/her, or seizes him/her. By focusing on this affect passion, the author will try to identify, define its contours in philosophical thought and psychoanalytic theory to identify its functions in family psychoanalysis, to perceive the impacts in the complex intersubjective fabric of family group whose mental life includes both ancestors and descendants.