My partner's father has emphysema, and I want to try uplift his spirits any suggestions?

My partner's father has was diagnosed with emphysema quite a few years ago now I believe, before I even knew my partner. Luckily he got 2 see my son, his first grandchild. But it sounds like he's getting a lot worse right now, and my partner is losing sleep thinking about it and im not sure what to do to try and cheer him up. I'm scared of him getting depressed over this, which will also mean less help with our son who is 3months old.