Please help

So ladies I need insight.

Me and my husband have been separated most likely headed for divorce and live in separate states. He recently told me his mom was sick and it's been going downhill for her and he seemed really sad. A couple of weeks past and I've been trying to call and text him to see if he's okay and to check on his mom but he doesn't call or text back.

I was thinking about reaching out to his siblings but in no way do I want to make it seem about me.

I don't want to rekindle the flame or anything I just really want to make sure he's ok. We were friends for 10+ years before we got married. Should I keep trying to reach out to him or let it go?