Can a family member of an alcoholic contact the bars that the alcoholic regularly visits?

[dent81]

Ever heard of freedom of speech? Guess you haven't... sad.

[curran]

You can contact anyone you want.

Will the bar care? No.

Dram Shop Laws vary greatly from state to state, there is no uniform law nationwide. So without knowing what state you are in, nobody has any idea if your threat would even carry substance.