I'm going to get pet rats when I know my sister hates them
Are you sure that she hates rats?
Yes, she is always telling me about how gross they are.
You shouldn't do things that purposely makes your sister mad. You should always try and get along with your siblings.
She is always so annoying.
I get that she is annoying but I still do not think that you should get rats. It is not okay to do things that you know are going to upset your sibling.