I have heard my friends on occasion say their mom or dad never hear their side of the story when they get into a fight with their younger sibling. They say their sibling always blames them when they fight.
I have always heard that adults sometimes expect the older sibling to be more patient and understanding with their younger sibling. As the older sibling I am already hearing this from my own mother and father. This is so hard sometimes.
There is eleven years difference between Gracie and me and Gracie is only 2 years old so she has not started to run to my parents when I find myself fussing at her when she does something I do not like. However, I understand parents do not care what caused the fight, they are generally unhappy that there was a fight to begin with.
Here is a suggestion I have heard that I hope you might try if you find yourself in this position. When there has been an argument between your brother or sister you need to wait until everyone including you has calmed down. Then you need to talk to your mom and dad privately. Do not go in blaming your sibling for the problem. For example, try to solve the problem by telling them your situation such as your brother or sister comes in your room without knocking or he or she will marks on your homework even when you tell him or her not to. Ask you parents if they might be able to help you or give you suggestion you might try. Then do what your parents suggest. Hopefully your mom and dad will see that you are really trying to get along with your brother or sister and then your parents will be less likely to fuss at you.