Objectives: Parents experiencing mental health difficulties consistent with "personality disorder", often related to a history of complex trauma, may face increased challenges in parent-child relationships and child socioemotional development. There are no published randomised controlled trials (RCTs) evaluating perinatal parent-child interventions for this population. We evaluated the feasibility and acceptability of undertaking an RCT of the video feedback intervention for positive parenting adapted for perinatal mental health (VIPP-PMH). Design: Feasibility study incorporating a pilot RCT.Methods: Mothers with enduring difficulties in managing emotions and relationships, consistent with a "personality disorder", and their 6-to 36-month old infants were randomly allocated to receive six sessions of VIPP-PMH (n = 20) or usual care alone (n = 14). Results: 76% of eligible mothers consented to participate.Intervention uptake and completion rates were 95% (≥1 VIPP-PMH session) and 70% (6 sessions), respectively.