Hi, Arlie,
It really doesn't matter whether he is an alcoholic (though it sounds to me like he is)--what matters is what his drinking (and your reactions to it) are doing to YOU.
I suggest you get to some Al-Anon meetings. You didn't say how young his children are, but Alateen (for kids from pre-teen through young adult) could be very helpful to them, if you are still close to them.