re: Friends son just passed away in a car accident

My cousin passed away unexpectedly several years ago. My uncle (as well as myself) were almost inconsolable (we were more like brothers).

After a few years my uncle mentioned that a lot of people stopped reaching out to him except for one friend (can't remember who it was, not that it matters) who checked in with him almost every week. My uncle said that was something that he looked forward to and helped him tremendously even if they didn't chat each time. This person also didn't avoid asking/talking about my cousin even knowing it would probably bring about another tearful response. My uncle said that's what helped him the most.
As mentioned, everyone grieves differently, but if someone can be that person for your friend, that might be the most help.