Background/Aims: Families require more specialised support to manage behaviours of concern following acquired brain injury within community settings. Evidence supports the involvement of family caregivers in behaviour interventions, however there are no validated behaviour support approaches for individuals with acquired brain injury emphasising family involvement. This research aims to (1) gain insight from rehabilitation professionals and family caregivers on best practice in behaviour support following acquired brain injury in community settings, and (2) obtain feedback on the proposed Family-directed Positive Behaviour Support Programme, which aims to enhance the capability of family caregivers in supporting behavioural changes in an individual following acquired brain injury. Methods: Rehabilitation professionals (n=8) and family caregivers (n=3) completed a three-round Delphi study with the aim of reaching consensus (75% agreement) regarding research objectives. Findings: All items presented regarding best practice in supporting family caregivers with behaviour support reached consensus. Results were used to refine the content and format of delivery of the Family-directed Positive Behaviour Support programme. Conclusions: Findings suggest an agreement regarding what support is needed, yet this is still not being provided. The Delphi process has made significant contribution to the Family-directed Positive Behaviour Support programme, which aims to inform a family-directed approach to behaviour support following acquired brain injury in community settings.