This research examines the dynamics of parent-infant interactions in families where the mother has postnatal depression (PND) and had received psychodynamic treatment, comparing outcomes across three groups: both parents treated, only the mother treated, and a control group without PND. Findings indicate that family involvement in treatment significantly enhances the quality of interactions and reduces psychopathological symptoms in parents, particularly when both parents engage in therapy. The study underscores the importance of considering both maternal and paternal factors in interventions for families affected by PND.