Is it possible to be a good parent/role model with alcoholism?
If still actively drinking, yes, but any good role modeling will be lessened and/or negated by the bad examples being shown at the same time.
If not actively drinking and in recovery, without a doubt and the potential is there to be the best role model possible. Good role modeling will be even more empowered by the journey from darkness into light and the example being shown of overcoming difficulties and adversities.