I shouldn't say this, but I'm starting to really dislike my little sister.
That's too bad. What's the problem?
She just bugs me!
You should try to talk with her to work out what it is that she is doing to make you dislike her and address that issue.
Yeah you're right. She's just a little kid. I need to be more patient.
Glad to hear you say that. Years from now at her wedding, she'll talk about how lucky she was to have you as a big brother, how you put up with her despite what a little pest she was.