AITAH for not letting my mother drink more?
I am 27, my mom is 58, a few days ago my sister moved out of the house and went to Omaha to live with her boyfriend. Nobody tried to stop her, letting her live her own life even though my mom had told me in private that she didn't want her to go, and neither did I but we all stayed strong and let her go to a tearful goodbye. My mom had been torn up about it but she kept going. She had always been a drinker of both beer and wine, I have an issue with her drinking wine because she'll drink a big 1.5 liter bottle followed by a 750 ml.
I never liked her drinking that much because of how drunk she would get and a fear of her not waking up would always set it. Tonight, she had texted me as I was getting off work asking me to get her a 750, I didn't object thinking she had a big bottle, and later when I asked on my way home she told me she only had two 750 bottles and not a 1.5 liter.
However I came home and found out that she was drinking a third 750 bottle that she already had and I got upset with her. She didn't need to be drinking a fourth bottle and apparently I am the asshole for being concerned about her health and not wanting her to drown herself in wine over my sister leaving. Now both her and my stepdad are upset with me and I have made my mom cry, maybe I am an asshole for getting upset, but I think being concerned about my mom's health is justified when I have already lost my dad. So tell me, Am I The Asshole?