I can tell you from experience that other family members don't care to get dragged into "my" recovery. The last time I tried to talk to a family member, I was forever shunned by that person! It hurt too. Maybe it's because they didn't know how to handle the information. What ever reason, I wish I had never said anything. I was desperately reaching out for help. I guess I went to the wrong person.
Now, I stay quiet and only talk about it to fellow alanoners and of course, my fellow SR friends!
If you feel you need to talk to them, try asking them why they don't come and stay any more.
Let them tell you.
They might not tell you anything. Of course you know them well enough to know if you could trust them and talk to them.