Curious about the article you are refering to...
As far as "tough love" goes, I think it really depends on the person. Some people you can drive even further away with a "tough love" approach. That was the case with me. At the same time, you definately don't want to be an "enabler", that was also the case with me. It's a fine line between the two. Most importantly you need to protect your soberiety and your family. If that means risking your relationship with your sibling, I feel you have to do what you have to do. Make sure they know that you are willing to help when they are willing to accept it, but as I'm sure you know, you can't get sober for anyone else other than yourself.
Welcome to SR to all the newcomers!! This is a great site with a ton of support and loving, caring members. Take care.