You may to rectify that issue with your parents. My sister doesnt do anything for me or even say happy birthday for me. I think shes very ungrateful towards me. I was even going to go to her workplace, and ask her manager to consider giving her a pay raise. I told her this she was unhappy about it. She has my number but doesnt talk to me. She is my sister but honestly its gotten to the point where i do not care anymore. Just do what you can, and if if doesnt work you may have to leave it as it is. Its different for you, its your parents that looked after you when you were young. Its alot easier to get your parents to love you then the older sister.