Background: Considering the potential impacts of family caregivers on heart failure management and the costs of healthcare, health professionals need to pay attention to the challenges faced by family caregivers. Methods: This study longitudinally explored the caregiving experiences of family caregivers of persons with heart failure. Serial interview scripts collected from 53 family caregivers were analyzed using a content analysis method. Findings: The following themes emerged: (1) accumulating knowledge and skills for caregiving; (2) losing a sense of control; (3) balancing an unstable life; (4) constructing illness memory; (5) centering the patient in daily life; (6) accepting the loss of a family member; (7) coping with grief by drawing on social support; (8) facing financial responsibility; and (9) rethinking hospice care. Conclusions: Family caregivers experience concern about unpredictable caregiving years, disease's fluctuating symptoms and poor prognosis. More educational opportunities, financial counseling programs, and palliative care consultations should be provided.