Hello!

So,

I work at a restaurant and i have been there for about two months, honestly best job ever and i make a good amount. Only problem is, we are short staffed. Our manger is asking us to hire new people and bring people in, such as my sister. I do not get along with her and do not want her working with me. I just need a separate work and time away. Although, she applied and is going in to my work to talk to my manager. I expressed to my manager and her how upset I’d be if she did so. My manager said he wouldn’t hire but my sister is still going to go in. I have told her over and over again how mad I will be. I do not think I’m in the wrong for not wanting my sister to work with me. Please help! What can I do, if she gets the job I think I’ll quit and I don’t want that. HELP!!