Up to half of heart failure (HF) patients are readmitted to hospitals within 6 months of discharge. Many readmissions are linked to inadequate self-care or family support. To improve care, practitioners may need to intervene with both the HF patient and family caregiver. Despite the recognition that family interventions improve patient outcomes, there is a lack of evidence to support dyadic interventions in HF. Thus, the purpose of this study was to test the Shared Care Dyadic Intervention (SCDI) designed to improve self-care in HF. The theoretical base of the SCDI was a construct called Shared Care. Shared Care represents a system of processes used in family care to exchange support. Key findings were as follows: the SCDI was acceptable to both care partners and the data supported improved shared care for both. For the patient, there were improvements in self-care. For the caregivers, there were improvements in relationship quality and health.