Tricky... I know when my brother and I would go to Michigan to be with my mom for the holidays, he would drink a 1.75 ml of vodka in one night. Mom would tell him to slow down, be careful etc. and it just made him drink more. He argued that he was an adult, didn't need the booze police, etc.
But in your case you are in recovery. My mom just didn't drink that much to begin with. Different dynamic. Do they know you are in recovery? They probably want to support you...