Shared decision-making is a well-recognized model to guide decision-making in medical care. However, the shared decision-making concept can become exceedingly complex in adolescent patients with varying degrees of autonomy who have most of their medical decisions made by their parents or legal guardians. The complexity increases further in ethically difficult situations such as terminal illness. In contrast to the typical patient-physician dyad, shared decision-making in adolescents requires a decision-making triad that also includes the parents or guardians. The multifactorial nature of (...) these cases can overwhelm treatment teams, with minimal guidance on how to best approach the patient–parents–physician dynamic in an ethically appropriate manner. Estimated time left to live is the paramount ethical consideration for such cases with respect to shared decision-making. This paper offers a sliding scale to serve as a grounding reference for clinicians who care for terminally ill adolescents and hospital ethics committee members for initiating and guiding the ethical discussion for these patients. This paper also elucidates several other ethically salient features inherent to many of these cases, including quality of life, treatability of disease, cultural influences, among others. Yet how each of these variables is weighed is dependent upon the specific circumstances of each individual case. Ultimately, shared decision-making in adolescent patients with terminal illnesses must be a collaborative and ongoing process that thoughtfully weighs the values and ethical responsibilities of the patient, parents, and physician to ideally reconcile differences and come to a consensus on the best management option for each individual patient. (shrink)