Drinks how? You will need a real reason to impact someone's rights in a custody order. What are you looking to accomplish? Absolute tea-totalling? or just stop them from being blackout drunk? Your odds change based on your goal.
If the child is of sufficient age and has been the one complaining or suffering the consequences of the drinking, assuming excessive or inappropriate drinking, then CPS may be called to investigate. If there are other witnesses or objective evidence, this is useful for the attorney in prosecuting your case. If you are talking about a beer with dinner or watching TV after work, then minor instances such as that would be spinning your wheels. Consult a family attorney for more assistance.
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