I am so sorry your father is going through all of this..
My best friend also has cancer right now.. With the radiation and Chemo she is mostly weak and tired. NOO food cravings at all so I totally understand about the food.
She was given an ipad and is really enjoying it.
I left her a few different books on CD so she can listen to them.
She is starting to get bed sores on her heels from sitting in a recliner so a nurse suggested a nice piece of sheeps skin to help.
Her husband purchased a new TV so a friend gave her a netflix subscription.
Acupuncture and massage is also soothing to her. She calls to schedule each week depending on how she feels.
Bird feeders outside of his windows could be nice.. also a squirrel bungie.. You hang it up place a corn cob on it and watch the squirrels go crazy!
Just calling him and letting him know you are thinking about him is probably the best.. He knows you have a family and will be there when you can.