My sister is the same way, very selfish and always out for only herself. She acts like she's 20...she's 43, owns nothing, and acts like my brother and had our stuff handed to us, like we don't have to work for everything we have. It's very frustrating and difficult to deal with.
Sure, there were some things that I was promised and we ended up not going because of her illness and I was disappointed... but calling her a terrible mother? Ridiculous. It doesn't help that she is getting everything and anything she wants with no boundaries from my dad. Oh, the double standard just kills me.
I want to help her, but I honestly don't know how.