First time Landlord-Potential Tenant does this sound like a scam?

[Dane DeKing]

I just got done showing the property. The potential tenant who came to see it shared with me the following:

The property would not be for her but for her 60 year old cousin who just had a stroke. He is no longer working and is on disability but they want him to live in this neighborhood because they have two other family members that live in the immediate area. He would not be paying the bills but his 90 year old mother, who lives several states away, would be paying all of the bills. Allegedly she is "loaded", has great credit, and owns a number of properties out of state. I was told that his mother would be willing to pay 6 months rent up front to make me feel comfortable. She also said they would look at buying the place.

I inquired as to who would be on the lease and was told it would be both the cousin and his mother. I gave her an application and asked for it to be filled out and returned for whoever would be on the lease. In addition, I informed her that I would be using Smart Move to run a background check and credit check.  

At this point there is no more action for me to take, maybe she comes back with the application maybe she doesn't. I just wanted to get some feedback on what the community thought about this story, how I should feel about the primary lessee not being a resident, if i should be weary of the offer of 6 months up front etc. Any advice or insight you could give would be appreciated, this would be my first tenant.