Re: Sensei -- drinking??
I think you should address this issue. Obviously the Sensei is having a very hard time. Can you ask to meet with him and then discuss with him what he is going through? Then you could ask him about drinking and if he is using alcohol to help him cope with his problem because you have noticed he seems unsteady. Obviously he needs help and understanding, but he also cannot come to the dojo that "tipsy." He might have an alcohol problem and need additional assistance. Consider this, if he's getting in a car to get to the dojo he could be a hazard to those around him. Although it is difficult, you must intervene immediately.