The author's clinical experience with the Child Protection and Mental Health Care systems informs this brief practice-focused paper. The author posits that Secondary Traumatic Stress and Vicarious Trauma are central to understanding the impact of relationally traumatic material and the experience of individuals, families, team and the wider ecology of care systems. In particular, the author hypothesises that the tendency of systems to become fragmented in operation, with silos of sub-parts working parallel to each other, may be a natural adaptation to the ways in which traumatic experience ripples across system boundaries. This ‘ripple effect’ may lead to increasing emotional and relational reactivity, and survival-oriented inward focus of energies and efforts. The metaphor of the brain and nervous system is used to explore ideas of connection and integration in care systems. Trauma-informed leadership by individuals and teams is also touched upon in relation to reducing fear-driven clinical practice.

This paper reviews the literature on human relational factors and their impact on complex care systems for a highly vulnerable population of children and young people in out‐of‐home care (OOHC). Factors contributing to the functioning of collaborative OOHC systems are reviewed from theoretical and contextual perspectives. The authors posit that secondary traumatic stress and vicarious trauma are central to understanding the impact of relational trauma and the experience of individuals, families, teams, and the wider ecology of collaborative care systems. Given the challenges of working collaboratively across interpersonal, family, and systems boundaries to support traumatised children in OOHC, further research is required.