He is committing fraud in his application by not informing you in advance of who was really applying for the unit.Hopefully he does not have a key, keep his first months rent and return any deposits.Remember you must screen every adult intending to live in the unit to insure each can afford it on their own. 

The persons living in the property are not the owner, but her adult daughter and family.

If your criteria says that each adult must qualify on their own, and these guys don't, then you deny.Plus, whenever you can legally deny anyone going through a divorce or just freshly out of one, it's the thing to do.  

LOL... but you can take It up with Johnthe ugly side of landlording.. its rare that I ever give a deposit back and I mean rare.they yell they cuss they threaten but they also do a bunch of damage.. most of them are just wind bags.now the one's that actually hand the property over and have lived there like responsible adults I give those back.. but most of my mid west stuff they never even ask. 

If her son is going to live with her in that house, you can certainly get all the adults who are going to live in the rental house to sign the contract.  

She will never stay in law school, and so she'll lose her funding.And once the BF/fiance moves in, he's a tenant who also has to be kicked out.I had a female law student whose "fiance" moved in, and he just sat round in the apartment playing videos all day long.  

Credit and background search each adult tenant that will be living in the unit. 

Is it the male or the female making the money?  

We realize your time is valuable so when we set a appointment time you are prepared, our application fee is .... per adult cash application fee or money order, no checks, and if your comfortable with what time would work for you....

I seriously hope you start to act like an adult on here.