Tell whoever you feel comfortable telling. The few people I told didn't believe me anyway. You sound like you are preparing for that to be a trigger and it probably will be. Maybe don't use the term "alcoholic". I have told some family members it "got out of control" or "just got weird". For some reason the term "alcoholic" makes people look at you and say "No your not". I didn't tell my husband until 2 weeks afterward because I was just too depressed to have that conversation until then.