I'm going to tell off my sister
Why are you mad at her?
She is extremely impolite and she does hardly anything for our family
You should talk to her about her behavior. It is not right for her to be acting like that to your family.
Yes, it has gone on for years and I'm fed up with it.
Confronting her about it is fine, but telling her off will make the situation work. You need to do it in a respectful way so she will listen to you.