Parental caregivers of young children with cancer face a distinct challenge in the home context: their children often cannot verbally articulate symptoms, requiring caregivers to develop embodied expertise through sustained observation and intuitive sensing. This paper examines how wearable technologies might support these caregivers, through semi-structured interviews with twelve primary caregivers, analyzed using Value Sensitive Design informed by Tronto’s ethics of care. Our findings establish caregiver agency as the central organizing principle for wearable design in this context. Caregivers function as primary interpreters who translate behavioral and physiological cues into actionable understanding, and they require technologies that enhance rather than supplant this interpretive role. We identify three value tensions that structure the design space: visibility versus privacy in monitoring, palliative versus curative care orientations, and caregiver autonomy versus child safety. We conclude with design implications for wearables that support interpretive competence, manage information asymmetry between parent and child, and sustain caregiver wellbeing across extended treatment periods.