What legal action do I need to take to get a 18 year old stepchild out of my house?

Question Details: I am married to a woman that will not tow the line with her 18 year old daughter. She lets her do what ever she wants, lets her disrespect me in my home, she lets her bully my children and when my wife and I argue she lets her but in and they team up on me instead of telling her to stay out of our business. She even has started trying to corrupt my kids telling them that mom is the good guy and dad is the bad guy. What can I do to get her out of my house?

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