I think you are talking about a bail condition, not parole. Parole is when you get released from prison before the sentence has expired. Probation is a separate sentence that can be imposed, which allows you to avoid jail as long as you comply with conditions. Both only happen AFTER a conviction by plea or trial.
It's up to you whether to "report" his violation of the bail condition. My own experience in court (I work in the legal fireld) is that the prosecutor will ask you whether you want alcohol treatment as a condition of his probation. I doubt you will be put in the position where you have to answer questions about whether he is continuing to drink. HOWEVER, if you are asked, you should answer all questions truthfully to the best of your ability, and let the chips fall where they may.
It helps neither of you to lie to help him avoid the natural consequences of his choices.