To develop the family Decisional Conflict Scale (DCS) and test its reliability and validity in the family of neurology ICU inpatients. Methods: The family Decisional Conflict Scale was developed based on the patient Decisional Conflict Scale. Total 191 family members of neurology ICU inpatients were enrolled to test the reliability and validity. Results: The family-DCS consisted of 16 items. Factor analysis extracted 3 common factors, and the cumulative contribution rate reached 68.024%. The content validity index was 0.990. The Cronbach’s α coefficients of the total scale was 0.885, and that of the 3 factors were 0.802, 0.861, and 0.924, respectively. The Guttman split-half reliability was 0.727. Conclusion: The family DCS has good reliability and validity, which can be useful for assessing decisional conflict level in the family of neurology ICU inpatients.