Very good job you're doing. Sorry you suffered with an abusive mother and alcoholism in your family. Alcoholism runs in my family too - my brother ended his own life by consuming a large quantity of alcohol. Luckily I wasn't abused. I used to be a social drinker when I was younger but now I just don't touch. Never really liked the taste or how it made me feel.
One thing you can do when your kids are age appropriate is, teach them about your family history. I'm honest with my girls and told them if they end up wanting to try alcohol, it should be moderate or better not at all. Personally I can't stand smelling it or seeing how people act. Seems like you're doing a great job in breaking the cycle.

If your kids are good parents too, then a good cycle will begin.