Aim: The purpose of this paper is to conceptually define "caregiver willingness" for application to a family member providing care to a critically ill loved one during an intensive care unit (ICU) hospitalization. Background: Delivering care to a family member may have psychological benefits for both the caregiver and the critically ill loved one; however, the willingness of family members to provide care is an elusive concept. Examination of the "caregiver willingness" concept will help to advance nursing science.