Squatters in my home, what do I do?

[Karla Gil]

I rented my home out to my tenants  with a 6 month lease that became a month to month as the lease ended. The lease stated no visitors for over 2 weeks and no subleases. 

Today my tenant is telling me sometime in Dec they let some friend stay with them for two weeks apparently attempting to charge him for the two weeks.  The guy named Aaron moved in  with his GF and kids and has refused to leave the house at all. They were not given a key but do not leave the home so they have not been locked out.

My tenant says she has given them an eviction serve  but they still refuse to leave. 

Tomorrow I am calling the sheriff to get more info. Has anyone had experience with this?  or has any knowledge of my rights?

I sent my tenants a 30 day notice today.