A Coping Toolbox filled with coping objects, items, photos, etc. for self care. This is a great idea for patients who need some coping skills. You can have them participate and make the toolbox together.
Another set of books that help siblings deal with the death of a loved one. These are so important because dealing with grief in this way is difficult for everyone, especially another child who does not really know how to grieve.
Ways to Help Prepare Your Child for Their Sibling's Surgery
Another ideas for Dramatic play with children. Cardboard Hospital: Pretend play to work through fear and anxiety. And children's book recommendations about doctors, hospitals and just plain being sick!
Accurately shaped internal organs, in stuffed animal form. These are a great tool for simplifying and explaining what is happening to children inside their bodies. These stuffed organs make learning about their illness fun rather than scary!