In short, my parents were both mentally, emotionally and psychically abusive to me, but not to my sister, except the few times my dad hit her when she tried to stand up for me. When I was a teenager, unsurprisingly I started suffering from depression due to the abuse, and took me a long time to became the healthy and happy adult I am today. I have been NC with my parents for 5 years now and my life is all the better for it.
My sister however has only gotten closer to them over the years. When we were kids and teens, we used to talk about how we can't wait to get away from them when we grow up and how horrible they are to me. Those talks gave me great comfort. But somewhere during the years that I have been NC with them, my sister has gotten very close to them and they seem to be a little happy family. Which is obviously very hurtful to me, but for the most part I manage to ignore since I don't speak to them and I don't speak to my sister about them.
Until today when she told me she has booked a holiday with them. They never went on holiday before, in fact my parents never went on holiday ever because they can't afford it. I have been crying for a few hours now, it really hurts that she would do this. Should I say something? If anyone has any words of advice or comfort it would be greatly appreciated because no one in my life would understand.