The purpose of this study was to describe family factors which influence cancer pain. Previous research has focused on the patients' and professional caregivers' perspective of pain. Cancer pain is an intense burden on the entire family as well as on the patient. Findings of the study demonstrate family perceptions of pain, caregiver burden associated with pain, caregiver moods and differences in caregiver experiences of pain between three sites of care including a hospice, a community hospital and a cancer centre. Understanding the perspective of the family caregivers and their role in pain management can assist health care providers in management of the patient's pain.