hire a good lawyer or a hit man, chances of success are about the same with each.
other than that do what he can do avoid her, restraining orders, etc. if possible. depends what the kids think of their mother? If they want out of the situation as well have them call the cops whenever she is drunk, a long police record will help your case if you go to court.
a private investigator may provide some damaging facts as well. court cases are based on documentation, do it right and it should* work out. He will never "get along" with her, best to never speak to her again, then the rage will go away...
good luck to Marty
