My younger brother is so rude and disrespectful to my older sister and me that I feel so bad. Like we do argue often but I am trying to change that but he doesn't. My older sister doesn't argue and she does so much for us like she picks him up nearly everyday after school and etc. but he still talks back and seems so ungrateful. When he never has to do something like and always destroys the mood by saying negative things and not apologizing. I don't know what to do anymore. I feel so bad for my older sister since it's like her last year before she goes to college and she can't even do some stuff becuase of him and she had to walk home in the past unlike him. I talked to him before about it and that he should be more grateful and how can he act like that. Talking to my parent is not really a option cuz... He's a pretty two face and etc. Is this normal?