I'm a petty person, but I'm human

I feel like I'm being totally childish, and completely petty. It's a feeling I want to shake, but it's too hard. For the past 15 years, my Mom and I have been dropping everything and running to Seagraves anytime my grandparents need us. They call, we run. I promised my Granny when I was about 5 years old I would always be there for her if she ever needed me. I'd always take care of her. I've stuck to that promise, because she and Papa have done so much for me. Here's where the pettiness comes in: My Papa's daughters haven't lifted a finger to help. One of them has had breast cancer, but not for 20 years - which is how long she's been away. The other one only comes around when she wants something, and last week informed my mother and me that she wishes her dad would just die. Her words were, "Being the horrible person that I am, I wish he would just give it up and die." I said, "I understand Dana, you want him to be able to die with some dignity." She says, "No, it's just his time, he needs to just die." WTF?!?!?!?! Papa has loaned her and her various husbands tons of money, and he's loaned my Mom money twice. Both times Mom paid him back in full plus interest. Dana and Paula do NOTHING. The last time Paula came to see him, other than last summer for a couple of hours, was in 1983!!! I try to tell myself that there are some issues there, plus come on! These women are 50/60 respectively. Get over it!! Papa is 94 years old, he's not going to be around much longer! So, last summer when Paula was there, he wrote her and Dana checks. Why? Their inheritance. He and Granny hadn't been paying the house insurance, but instead, putting the money in a checking account seperate from the other. He split that money between his daughters. apporx. $162k. I have no right to feel this way, but I'm hurt, in shock, and angry as hell. It's not my money, and I don't really even WANT money. It's the priniciple. He refuses to call them when he's sick. He cries when Mom or myself leaves, and barely looks their way when they leave. He begs Mom and me to stay. But, Dana and Paula, the lazy cows, do nothing and get rewarded. I am sooooo petty! Everyone keeps telling me I'm justified, but I feel horrible feeling this way. May it IS the money. Maybe I'm an awful person who feels entitled. I hope that's not true. I just keep thinking of my Mom and how she needs her bottom teeth fixed desperately, her car is old and needs a new transmission, she lives in a crappy rent house, Heath needs college money, I haven't had a car in 4 years, I need surgery worse than ever - and there Dana and Paula sit with $80k each, married to wealthy men, and want for nothing. They do nothing, and get rewarded. I'm childish, petty, judgemental, and pathetic, but It's not fair. My mother deserves better than that. I deserve better than that. They deserve next to nothing for their "efforts."