So last year around Christmas I had a falling out with my sister. We were in Las Vegas for the holidays (where she lived at the time) and were trying to have a fun family-filled Sin City extravaganza.

However, my sister ruined all of this. She yelled repeatedly at my mother and I about our incompetence on how to behave in "nice" establishments, bullied my mom emotionally and physically, drank constantly (but she was even worse when she was sober) and honestly just put a damper on the whole trip.

For me this was just the last straw. We had been getting along for a while before all of this, but she has no apologized for her behavior and shows no remorse whatsoever.

I don't like her anymore. Of course, I wish her a good life and peace and happiness, but everytime I'm around her I am reminded of what a selfish and shallow person she really is. I have no idea how to remedy the situation, and I'm not even sure that I want to do so.

However, the holidays are coming up, and I'm sure I will be expected to interact with her again. I would confront her with these feelings, but last time I brought it up she told me to go fuck myself and that I was a fat ugly worm who should mind her own business.

Why on earth would I associate with someone like this? What should I do at all?