Family attendance at oncology consultations is known to be beneficial, but can also add complexity and challenge to clinical encounters. There is a paucity of practical strategies guiding effective clinician-family communication. Effective family involvement can result in improved patient care and outcomes, whilst providing an opportunity to address family’s informational and emotional needs. However, if not well managed, some family caregivers can derail consultations and impede patient care. Clinicians value family input, but find many aspects of family involvement challenging and want help navigating these complex triadic (clinician-patient-family) interactions. Yet there are no guidelines nor specific training to help clinicians manage/improve interactions with family caregivers. To address this, over the past 5-years, our team has completed the TRIadic Oncology (TRIO) research program, which comprehensively explored family caregiver involvement in consultations and treatment decision-making, ultimately proposing the first international, theoretically-guided, evidence-based (TRIO) clinical practice guidelines for clinicians, with accompanying training videos. In this talk, the key TRIO guidelines/strategies will be outlined, divided into two sections: i) Facilitating collaborative and effective family involvement (6) and ii) Managing challenging or complex consultations (7). Excerpts from TRIO short films modeling the key strategies will be shown to illustrate the targeted behaviours. The latest TRIO work on translating the guidelines and videos into online training modules for clinicians and patient-caregiver pairs will be also discussed. This research represents a progressive step in transforming communication in clinical practice by promoting a shift from ‘patient-centred’ to ‘patient- and family-centred’ cancer care.