Sounds as if you're doing a pretty decent job with them. Good for you. Please consider taking them to alanon meetings suited for their age. Or find a therapist/counsellor who specializes in addictions and take them there. They do need to get the full story about the alcoholism as soon as possible. It's time for them to find out that dad is really sick with a disease called alcoholism. It will, hopefully, be woven into their very being with continual education. It may also teach them at an early age that they don't want to ever drink. And, don't forget to find meetings for yourself.