w has been acting disrespectful to my parents now. We live in their house and she doesn't pay rent, I do.

My parents have always been there for her and have loved her like a daughter. My mom takes her daughter to and from school and babysits her free of charge until we get home from work.

I feel angry and I'm having to bite my lip. I'm not sure what to do but I have a problem with W openly disrespecting them.