Donald is a non-drinker, who made this decision by observing a tragedy in the family and, apparently, holds by this decision since. At least, none of the special prosecutors caught him with a beer. You can use this amazing example of middos. And also, value of learning – easier not to start drinking or stop early than later count days after attending AA.
He also has a big family, counting both children and wives, and his grandkids go to a Jewish school.