exact 10 years ago I was in similar situation as your brother, but i was ready to change.

In May 1997 i met Hans the first time and he introduced me in Kriyayoga and feeling energy in general. So the effects of drinking alcohol or taking marihuana where much more transparent for me and I changed my habits.

If your brother declines to do Godyoga then he is not ready to do his part.
Let him do what he wants until he suffered enough and really want to change.

god bless you
wolfgang