Recommendations on activities for my grandpa who had a stroke that affected the right side?

Get to the PCP, PT, OT....it is all available to your grandpa.

Peripheral Neuropathy usually affects both hands and both feet. First, there are good medications for the pain. Second, there are stimulating exercises that prevent painful contractions. Ask the MD about PT (physical therapy) for him to preserve his range of motion. Or google "PT range of motion" for things you can do at home.