Family issues with tenant

[Phillip Gonzales]

Hello I have an issue with my wives grandma. She is currently residing in a house that is owned by my wife. Her grandma is not paying rent and has been residing in the house for the last few years. The home was originally her grandmas home who transferred title to my wife after falling back on taxes. Her grandmother is now trying to take my wife to court over the house since she is saying the house is hers and wants it back. To make an even longer story short. We are trying to sell the house and get her grandma out, but were unsure if we have to give notice or have police remove her. Please any info is helpful btw we are in Arizona