Please keep them all in prayer for restoration, repentance, and healing in this devastating situation. We love the DeWaay's very much and have been blessed so greatly by his teaching.
Drinking is not a sin in itself, but drunkenness (and I would suggest addiction, whether or not you feel drunk or high) is. The line is often very blurry between these two and many people find themselves entangled without knowing what to do.
May the Lord guide the elders at Twin City Fellowship, and the DeWaays, as they go forward. You are all in our prayers.