J.B.
I had a friend who's daughter died after being home for 5 days. They thought she was healthy, and the doctor's said she was healthy, but it turned out she had pneumonia. No symptoms, just stopped breathing one day. I, like you, had no idea what to say/do. My mom (who handles death better than anyone I know) told me to say things like "we're thinking of you, you're in our prayers, etc.". She thinks saying "I'm so sorry" can just make it worse. you know, like when you are on the verge of tears and someone asks how you are, so you just break down and cry? maybe that's never happened to you, but I understood what she meant. Also, I would cook them dinner, things that can go in the freezer and cooked whenever they feel. I wouldn't bring your son to the funeral or to visit unless they specifically ask to see him.