It is a general assumption that an alcoholic must be motivated in order to assimilate a treatment. It is a truth with modification. The purpose of the treatment is to convert the 'external motivation' into 'internal motivation'. Many alcoholics do not regard themselves as 'alcoholics' at the arrival at a treatment center. Alcoholism is most often regarded as a 'family disease'.
Family members has no possibility to avoid or ignore the one with the disease.
Most alcohol addictive symptoms are behavioristic. In time, rest of the family will start to feel bad. No family member have ever caused alcoholism. Even so, the family can, in spite of good intentions, act in a way that will further the alcoholics behaviors. The alcoholics behavior increases the family's anxiety level.