@Chris Virgil-Stone Never and I mean never rent to these single women that have their adult son living with them.

It could be millennials moving home to cut costs, adults sharing single family homes to cut costs, macroeconomic fright of some sort, etc. 

The only other job I have had as an adult was serving in the US Army on the late 1980s.

Something here isn't right.I agree that "technically they are adults, so they should know better," but what about our rocket scientist above?

It's small (2 bedroom, 1 floor) but perfect for a retired couple or a single adult on their own.

A beautiful family of 2 adults and 3 kids recently liked my house and are willing to rent it out.

The extra occupants will be one adult and two boys (11 and 15).My lease agreement states that number of occupants is three unless written consent is provided by the landlord.

It is possible you may require a parent/guardian to co-sign or provide a guarantee for any contracts or, perhaps sign an affidavit of consent.Here, far to your north, the age of majority is 18 for most legal matters, while legally you are considered an adult at 16 for others.

Our policy requires us to screen all adults living in the unit.For example, we currently have a couple that have applied.

What does it say about a young adult who makes below the poverty line and yet Mom and Dad will pay to have them out of the house?