Christiane Knecht presents perspectives for science and practice on how siblings can be supported in the context of a sibling's chronic illness. In this Grounded Theory study, the author examines how the relational dynamics appear from the perspective of healthy siblings growing up with a sibling affected by chronic illness. She demonstrates that it requires adjustment and family work from the healthy siblings to navigate seamlessly between their own social world and the familial world disrupted by the illness. Author Christiane Knecht is a nursing scientist and currently holds the Chair of Acute Care at the University of Witten/Herdecke. Additionally, she works there as a postdoctoral researcher in the cooperative research training group on family health across the lifespan at the University of Witten.