I heard a great podcast with Frank Ostaseski where he talked about how isolating death is. No one wants to bring up what happened, because it may upset you (spoiler: you are already upset) and you don’t want to burden others by talking about it. This traps you into dealing with it alone. I think the best thing you can do is just be available. Tell them you are genuinely want to listen if they want to talk about it. Perhaps make the offer again in a few weeks when others have moved on. No pressure, just be open to listening. Most of us just want to be heard

Have you heard of the fireplace delusion? Burning wood is horrible for our health and the environment, but most of us have fond memories of sitting by a fire. Religion is the same. Holiday traditions with family, organized events marking important life events, it’s hard to break away.

https://www.samharris.org/blog/the-fireplace-delusion