What is the relationship between law, morality and ethics

What is the relationship between law, morality and ethics? Should the law reflect morality or ethics, or both? Explain.
Question 2
Consider gambling, prostitution and alcohol in the context of the intersection of those ‘sins’ with the law. Should any of these concepts be unregulated and or be unpunished by government? How much of the morality of these actions should be considered in the creation and enforcement of laws against gambling, prostitution and alcohol?