She has a working boyfriend, two 16 yr old daughters, and a son she splits custody of.

There are enough small things that bother me that I thought I would seek input from more experienced landlords.Single dad (with 2 85 lb mastiffs), his 19 year old son, 24 year old daughter and her boyfriend. 

People letting girlfriends/boyfriends staying over too often.

My boyfriend and I recently moved into a house after years of terrible apartments.

This was the boyfriend or husband that told me why they don't run it.

No unemployed live-in boyfriends (which is what he really is). 

And I didn't get involved in what, if anything, they paid the original tenant.The reason I did it this way, is because boyfriends and girlfriends come and go. 

Boyfriend and girlfriend signed the lease.

I rented to a lot of graduate students, and their boyfriends or girlfriends would often move in. 

Trust me, you don't want to deal with this tenant, I GUARANTEE you that there is some boyfriend/baby daddy/boo boo bear that will be moving in with them, and since that person is not on the application, that in itself is a whole 'nother can of worms.