Parents, yeah?

Well, currently, I am officially homeless; but more about that in another post.
I have just spent the last five days at my parent's place; it was a weird mix between nostalgia, connecting, and our differences in lifestyle;
I enjoyed peacefull walks in the town I grew up in. But, at the same time my parents are getting older, and are comparing me with me siblings. One of them is a addict, and the other eloped when he was 17, he is ~10 years older, my sister is about six years older, she is addicted to -well- whatever, but mostly coke and alcohol. 
Now, I do really enjoy my smokes, and the occasional red wine or whisky, but my parents, mostly my mother, really doesn't like when I drink more than one glass of wine, since she connects that to my sisters' alcoholism. It seems like she can't seperate my sister and me when it comes to just having a occasional drink. This frustrates  me to no end, but I've learned to live with it mostly.
However, I was at my parents' house for almost a week, and my mother didn't allow me more than half a glass of wine, because otherwise I'm also seen as addicted. When I asked for a glass of wine, she told me she was afraid I was drinking to much, because my sister is addicted to alcohol (amongst other things). In one morning at my parent's place, She thought I secretly stole and drank half a bottle of wine at night, only to say that and go to a friend. This pissed me off to no end, because I would not do that. Later she apologized to me because she confused a half empty bottle of port with the bottle of wine. Still, the mistrust really hurt me emotionally.
 It feels like I am living in the dark dark shadows of my siblings. Anything that broke the trust between my parents and my two siblings, is shadowing over me, my sister is addicted; so I am experiencing scrutiny when I have one glass of wine. I am under scrutiny under any action that my siblings fucked up, ever. And that's my life.

Now I know I can't change my parents, they are in their 70's, and they don't learn anymore. But it hurts quite a bit