Families and loved ones usually avoid talking about problems their members are having.
There are those who either deny that there is a problem or acknowledge that there is but do not inform friends and other distant relatives. These friends and distant relatives would be surprised to know that there has been checked-ins at alcohol and drug rehab centers that they didn’t know. At times they may feel left-out specially if they know they can help.
For others, it would be just a “need to know” basis to avoid negative talks and negative impressions. Makes sense.