Family involvement is integral to many clinical decisions in East Asian healthcare settings, yet its ethical status cannot be determined by the mere presence or intensity of family participation. Relational autonomy explains why patients may exercise agency through trusted relationships, shared deliberation, interpretive assistance, emotional support, and even voluntarily delegated roles. The same relational structures, however, can displace patient authority when access to information, opportunities to speak, or practical decisional control become governed by others without the patient’s authorization. This normative framework examines the transition from relational participation to what is termed moral substitution: the exercise of practical control over a decision in place of a patient who retains relevant decisional authority and has not authorized that transfer. Drawing on contemporary relational-autonomy scholarship and empirical evidence concerning informed consent, disclosure, shared decision-making, and family-mediated clinical practice, the analysis distinguishes influence from control, chosen deference from imposed displacement, and support from surrogate decision-making. It argues that patient authority in relational settings depends on continuing access to relevant information, an effective opportunity to express preferences, authority to define the family’s role, and the ability to revise or withdraw that authorization. Clinical responsibility therefore concerns not only coercion by relatives but also institutional routines that convert family involvement into de facto decisional authority. The resulting account protects family-inclusive care without treating either individual independence or family leadership as ethically presumptive.
