This work-in-progress presents and reports on the design of Child Remains; an artistic, practice-based project that investigates how XR technologies can be used to create affective, immersive museum experiences that support public engagement with personal and collective grief. Developed in collaboration with the Lilla Ånggården museum in Sweden, the project bridges digital heritage with contemporary experience. The installation combines VR, storytelling, tactile artefacts, and dialogical encounters to explore how immersive environments can create space for conversation, memory, and emotional processing within museum settings. This paper outlines the design rationale, methodological approach, and preliminary insights, contributing to HCI discourses on cultural heritage, XR, and designing with grief.