"Tough love" or loving from a distance is the approved way to deal with active addict family members. Anything else risks enablement of the addict, not to mention safety and property of the family.
Still, it's incredibly hard to watch a close family member self-destruct. Many times, that leads in fairly short order to a rock bottom for the addict and the necessary realization that they need help and acceptance of it and recovery. Other times, it's going to lead to long term homelessness, jail, prison, and mental institutions.
I had seen an article in connection with the film About Charlie where the Reiners had used this approach for many years, but Nick remained incorrigible and they gave up and began enabling him again.
Fucking brutal.
I've spent a lot of time talking to and listening to the stories of addicts and the worst things I have ever heard inevitably concern their addict children.