The first step you should take is to do a lot of research on the subject. Look at the specific type of cancer he has as well. That means to search the web, talk to family and friends and maybe a doctor. Understand everything you can about this and then be understanding to your grandfather. Things you need to learn about are behavior changes. You need to understand the changes he might go through when and if he gets a treatment. Look for national, regional and local resources that could help him out. The best thing you can do is to be there for him and support him in any way you can.
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