What, if anything, would you say or do for a family friend who was just diagnosed with cancer?

I asked about the cancer itself here: https://www.fluther.com/215340/do-you-know-of-anyone-who-was-diagnosed-with-lung-cancer/

A family friend was just diagnosed with cancer. He and his wife are both friends of mine, and their children are friends with my daughter.

When he was in the hospital, I reached out to both him and his wife and said if you need anything, please let me know, and I offered to take the kids to dinner and stuff like that.

Now he’s home and his wife was the one who texted me and told me he has a positive diagnosis, and is going for more tests.

Their lives are carrying on as usual, so far, with taking the kids places and working, etc.

I don’t know if I should text and say something kind, or send something like a card, or just do nothing.

My mom had cancer but that was slightly different, as the boundaries of my relationship with my mom were different than this, a family friend.

What have you done in a similar situation? What should I do?