How to get over jealousy of knowing my parents love my sister more than me?

For decades my father's mother didn't treat our family right. It may have been something about my father, or just that his sister was very charismatic, and so was one of the wives of Dad's next eldest brother. So Aunt Jane's kids and Uncle Paul's kid were the "golden children" and everyone knew it.

One Sunday after all the grandchildren were grown and some even had their own grandchildren, my siblings, plus my spouse and I, were all over at Granny's.  As one of my older siblings was saying the last goodbye, Granny teared up. We were the only family to visit her that day and Granny's disappointment in the others was palpable. All she said was, "I think I owe you kids an apology," and my sibling (the eldest, and thus bestowed with the apology) simply said, "We're family and when we say we love one another we all know we mean it."

Nobody ever told the "favorites" what Granny said. We love each other!

All you can do is try to ignore it, its hard, I know first hand. Its not your sisters fault, its your parents. Use your parents for a college education, get a good job, then have nothing to do with the. I have been in your shoes, there is noting more you can do.

maybe you should ask your parents this question