I would suggest trying to get in touch with the hospitals Child Life Specialist. These individuals work with and support children and their families through out their hospitalization. Sometimes simple things like pinwheels help to encourage children and teens who are required to stay in bed for extended periods of time. They do this instead of the inspirex (sp?) You may also want to find him a marshmallow shooter which does the same thing...It's also a lot of fun to shoot marshmallows at your nurse!!! For teens a journal might help to allow your nephew the opportunity to vent his frustrations and fears that he might not feel comfortable expressing to others.
Someone suggested
www.caringbridge.org This is a wonderful communication tool for families. It helps to let everyone know what is going on with out having to make a bunch of phone calls are rehash news. It is also a great way for family members to express their feelings as well.
Is your nephew a jokester? You could see if you could find a book for medical/hospital humor might be fun too. (I'm not sure if they make these)
Information sometimes helps too. One website I would suggest is here:
http://www.cart32hostingred.com/cgi-bin/cart32.exe/CANDLELIGHTERSCHILDH-store
They have a section on hero beads. Again, check with the child life specialist or your family and see if they have a program called bravery beads. If not, this is a great idea to commemorate the journey that your nephew is taking. Each bead means something (radiation, chemo, blood, etc) Your nephew's mom or dad could keep tabs on what he is having and each week you could send him beads that coordinate with his treatments. PM me if you have any questions on this...It's hard to really give you the whole idea in just this post.
Also, does your nephew do well with needle pokes. Sometimes this is the most painful and difficult thing for kids and teens to go through. Things like stress balls help get them through the needle poke or painful procedures.
Fun stuff like rubix cubes, slinkies, koosh balls, glitter water filled bouncy balls,silly things that you would probably find near check outs.
Also, one last thought...
www.finditgames.com These are great tubes that are filled with little plastic pieces and small objects to find, a penny the letter A they are really a lot of fun!
If I think of anything else I will pass it along. If you have any questions about the bead suggestion PM me and I will give you more information.
Someone else posted this-but I have to say it again....CANCER SUCKS!!!