I keep asking myself the same question over and over again...

Why wasn't I good enough for her. I have been thinking about my mom lately and I just do not understand for the life of me how you can be great to three of your kids and two single out and treat them differently. I thought maybe when my little sister and I became adults things will be different. Maybe when we have children and she is a grandmother things will be different but guess what? They aren't. I have called her and called her and no return calls, no messages, no nothing. The only time she paid us any attention was when we flew up there to visit her. When do you cut your losses? Mind you, this is all complicated by the fact that she has lung cancer and end-stage COPD. I am so so tired of trying and I know my sister feels the same way. My dad already passed away in 2016 so when she is gone we have no parents. I guess I am just sad because I just cannot answer the question of why I wasn't good enough for her.