What to get my dad for birthday?

He's in the hospital and was diagnosed last week with aggressive Non Hodgkin's Lymphoma. I just can't wrap my head around it. I truly don't want to lose him. 🙁
We are still talking treatment (chemotherapy) but they don't want to essentially do it because it's high risk for fatal infection in his condition ( former stroke victim).
His birthday is this month...what gift could I get?