Non-hodgkins Lymphoma Mouth How Can I Help My Grandfather, Who Has Just Been Diagnosed With Non-Hodgkins Lymphoma?

How can I help my grandfather, who has just been diagnosed with non-Hodgkins lymphoma? - non-hodgkins lymphoma mouth

He is undergoing chemotherapy
I want to be there as much as possible and support.
To be, in addition to optimism and a positive attitude, what can I do?