Barack, Sr. lived large, drank heavily and had multiple wives because he had come from a polygamous background. To him it was socially normal.
President Obama is rooted, extremely cautious, responsible, monogamous and an attentive father. He's the typical profile of the child of a raging alcoholic.
You see a lot of this reaction from the next generation in politics, the military and the intelligence community. Even President Bush 41 reacted in a similar fashion to his father, Senator Bush, who was an alcoholic.