I let dd sip coffee. In my family people have been giving their kids coffee and tea for generations. In fact, I was drinking a cup of coffee every morning by the time I was 12 or so. We were also given hot totties when we were sick (hot whiskey, lemon and honey). Maybe it's a Scottish thing!
I don't drink martinis, but I let dd sip wine and beer(we rarely drink at all, maybe once a month)