I'm going to see my sister's favourite band without her
Wouldn't that hurt her feelings? Why would you do something so mean?
I don't want to keep in touch with her anymore, I've enough of that trash.
Wow, I bet she is going to be very upset. Even if you do not want to be around her right now, I still think that you should try to take her. You know how much she would enjoy it.
You don't know how much my sister bothers me. I don't want to go see a band with someone I don't care about.
That's a pretty harsh statement to make about your sister. You should spend some time with her and try to connect with her. Maybe then you understand how important family is, and begin to care about her.