When I had cancer, I was the single mother of a 10 year old and a my family was useless. The most helpful and appreciated things to me were people bringing food, taking my daughter to movies or out for fun events. These things were most appreciated when I was further along in treatment and therefore really tired. And audiobooks. I didn’t really have the energy to read, so audiobooks helped a lot. Cards were always appreciated. And they are(will be) kind of overwhelmed, instead of asking “what can I do?” every time, make suggestions. Good luck to your friend.