Evict a family member

[Nixon Vayupak]

How does one evict a family member who has been living in the back house for more than 15 years and has not been paying any rent but only pays partial utilities when they are in the mood.  We tried offering cash for keys, but that did not work.

Trying to purchase the property from a relative. but every one is concerned about the dead beat who will not budge and not move at all.  This property is located in Southern California so I am not sure what would be the ideal approach to make things go smoothly with the law here.  Any guidance will be helpful.