one of them arrested for auto theft in April.What the heck do I do now?

Would you like to be notified when your tenant was arrested, filed for bankruptcy, began divorce proceedings, etc? 

You will not be arrested.  

The police might not take it seriously, but the threat of arrest might motivate them to at least bring your stolen property back.

I would ask tenant to pay or tell them cousin is going to be arrested for B&E.

“HUD will use the full force of the law to protect the fair housing rights of folks who’ve been arrested or who’re returning to their communities after serving time in jail or prison,” HUD Secretary Julian Castro warned.By “full force,” he means the “disparate impact” theory of civil-rights enforcement, which HUD claims is written into the Fair Housing Act even though the phrase appears nowhere in the statute.Disparate impact holds businesses liable for colorblind policies and practices that may have adverse outcomes for minorities — in this case, screening all apartment applicants for criminal histories.

Then take the next step: engage the proper authority, ask tenant to explain, look the other way and have it come back 10 fold should the detectives want  to "ask you a few questions" upon his inevitable arrest. 

He was arrested at my property.

I also told her if she talks to me again or comes on my property I will have her arrested for trespassing.

Since she was arrested, there will be a police report stating that she abused an elderly person.