That only works on city folks.
Bullshit
He stopped drinking to save his marriage. Maybe that's all it is. Maybe this is him, learning to be sober. People who drink and use meth usually drink a whole lot more on meth. They don't switch from one to the other. Talk to sister. If thee is a problem it's her problem unless she asks for help. Otherwise don't interfere in other people's personal development. Everybody has our own lessons to learn. Interfere and you wind up paying Israhel 5 Billion to invade you.