Glad you asked...
Many times it may take legal action to kick someone out of your house. You will most likely have to take the approach of an eviction and kick them out that way.
Then again, this answer might help you...
To kick someone out of your house you can simply ask them to leave. If you have a written agreement with them and they are paying you rent, you will have to get the law involved for the proper procedures on eviction.

