I tried having a better relationship with her, as compared to my first sister. It worked for a while, but because my parents are selfish and inconsiderate, she too has been raised to be selfish and inconsiderate. I also think that it is my family members putting ideas in her head.
The last time I saw her was 4 years ago, after about 11 years when she and her friends from her job elected to do a road trip down to a neighboring state for a vacation and then stop by to see me for dinner for a few hours. However, she did not tell me until they were on the road, which was not fair because she had plenty of time to tell me. Being that I had not seen her in person since she was 7, I had really wanted to join her on that trip, but she said no, which neither my dad and I approved of. Though we tried to come up with something, it did not work out. So she came to my city as planned and we had dinner with her friends. Looking back, that whole thing was an obligation as she did not seem like she was happy to be there and nor did she look happy in the selfie.
I fell out with her over a year ago because she stabbed me in the back when my aunt died, with who I had a closer relationship than my own parents. It turns out that my dad has Parkinson's disease and she had thrown a few crowds-fund-raisers for him, which she attempted to keep from me. So when I found out, I attempted to share it, only to have her hide it from me. After that, I stopped talking to her. Meanwhile, she had the nerve to send a holiday card stating that she "Missed me," but I did not respond.
As for the engagement part, I confronted her which I did gently next to telling her I did not appreciate the way she and the rest of the family have been treating me. I am pretty sad being this is a big deal.