No. I would consider your Dad a drinking buddy who is unaware (or doesn't care) that he is undermining his son's recovery. Although your Dad isn't pouring the beer down your brother's throat (and your brother has the responsibility to say no), I believe that drinking (or drugging) in front of a person new to recovery is insensitive. Offering them beer is beyond insensitive.
Addicts/alcoholics thrive best if they surround themselves with:
1. Other users.
2. Codependents.
I agree with you. Going from drug use to alcohol is the same as switching seats on the Titanic.
gentle hugs
ke