It depends. I wouldn't shun a family member, and I wouldn't withold assistance/help towards them if they needed it. I realize that it would cast me into bad status within the congregation for doing so, but, that wouldn't stop me either.
That being said, there are some in my cong that have been DF'd for smoking crack, and if you were to show them any invitation of kindness they would abuse that. They do get a smile now and then, and a coin is tossed into their cup when I see them downtown.