I was only able to convince family to use Signal because they didn't need two apps for messaging. It's pretty much a dead app for me now and the decision makes my conversations profoundly less private and safe.
Did all of your family members only message you and not each other? I don't understand why they would move away from signal when they were messaging each other using signal. Each one would have several signal contacts.
Did they not see any value in signal over SMS? Didn't you have any group chats?
Did they not see any value in signal over SMS? Didn't you have any group chats?