Intensive care unit (ICU) survivors may experience deterioration in their quality of life for months following their return home, with families assuming a caregiving role. The aim of this study was to measure the burden associated with caring for a family member who had been critically ill. The study also sought to describe the relationship between three factors (filial obligation, social support, self-efficacy) and caregiver burden. Seventy-one family carers, 51 females (72%) and 20 (28%) males of long-term intensive care patients completed a mailed survey, after signing an informed consent form. Although the vast majority of the caregivers were providing substantial number of hours of care each week, they scored lower than the midpoint on all caregiver burden inventory subscales. Filial obligation was found to be positively associated with caregiver burden; however, there was no association between social support, self-efficacy and caregiver burden. Male caregivers experienced significantly more burden than female caregivers. The findings suggest that an understanding of the factors that impact on caregiver burden of families of ICU survivors is only beginning to emerge.