This study's purpose was to evaluate the psychometric properties of the Shared Care Instrument-Revised (SCI-R) in a sample of family care dyads. The SCI-R was developed to measure the construct of shared care, which is a system of three constructs (communication, decision making, reciprocity) used in family care to exchange support. An important aspect of evaluating the SCI-R was to create a measure that is statistically sound and meaningful for patient and caregivers. Surveys were mailed to randomly selected home health dyads, which included 223 patients and 220 caregivers. Reliability and confirmatory factor analysis, and concurrent validity were examined. Internal consistency reliability of the patient subscales ranged from 0.74 to 0.76, and from 0.72 to 0.78 for caregiver subscales. Factor analysis supported the underlying theoretical basis of the SCI-R. Construct validity also was supported using the hypothesis-testing approach. One major challenge in family care research is to develop methods and tools to study the dynamic characteristics of close relationships. The findings from this study support further use of SCI-R to study how shared care facilitates the exchange of support and the influence shared care has on outcomes for both patients and caregivers.