The psychotherapy field has a long history of integration to improve treatment effectiveness. One type, assimilative integration, offers innovative opportunities to family therapy to incorporate the clinical and research contributions of different approaches. This paper contributes to the literature on integration by exploring how Eye Movement Desensitization and Reprocessing (EMDR) can be assimilated into Attachment-Based Family Therapy (ABFT) for youth in residential psychiatric treatment. ABFT seeks to improve attachment security to parental figures by asking adolescents and young adults to discuss attachment ruptures. This process, specially designed for patients with internalizing disorders, can provoke anxiety, particularly for a patient population that commonly has a history of trauma and adverse life experiences. EMDR is a first-line therapy for post-traumatic stress disorder and has the potential to be effective in treating various other mental health conditions. When patient emotional withdrawal or dysregulation due to breaches in trust between child and parent emerges in ABFT, EMDR may help desensitize associated memories and bolster the family therapy process. The authors provide an overview of both models, and a detailed case study as an example. The paper concludes with a discussion on implications, integration efforts, and limitations.