It sounds like you and your wife are getting a good start.

Everyone here started with zero experience, so you're amongst friends ;)Sounds like you have a solid plan of attack to build your network.

In your case, it sounds like they have had advance notice that 9/10 is the move out day.You can dispose of their items the next day. 

Sounds like you're doing all the right things to get yourself educated. 

And by the sounds of it it’s not doing your wallet any favors.

Sounds great!

To me it sounds like I should get rid of it.

It doesn't sound like she mentioned plans to move him in.Also divorce and marriage certificates are public records, it shouldn't be hard to verify her marital status.

Having access to the financials, documentation, and physical inspection will help you make a sound business decision as to proceed, or move on.

Usually rentbacks call for higher rents than market, not lower. of course, those situations I've seen have always been short term. you make it sound like this can be several months. in that situation, I would tell them they have to pay market rent, and provide security deposit.