My sister always bullies my sister. You should educate yourself like this, tell your parents and let them make decisions for you. There will be more or less conflicts between sisters or brothers and sisters. Maybe someone robbed someone, or was too naughty to make my sister angry, or because you were younger than her and bullied you. At this time, you are young and weak, so you should ask your parents for help, show them who is right and who is wrong, and then tell your sister not to bully your brother and sister all the time. It may also be because parents prefer younger children, ignoring their sister's feelings, making her dissatisfied and bullying you. Then you should take care of your sister more often. If you have something delicious, or something good from your parents, you can share it with your sister, live in peace with her and play with her more. Even if your parents treat you differently, her brothers and sisters will not bully you.