Maximum Occupancy in an Apartment

[Eric S.]

The majority of the real estate holdings I have are single family homes.  We have one duplex that periodically makes us scratch our heads when trying to rent it. 

Case in point.  This weekend my wife showed the open unit to a nice woman and a 7 year old.  She is very interested and financially and rental history she would be a good renter.  Later we find out the 2 BR unit would be for not only her and the child but additionally a husband, and two teenagers. 

We've never thought we needed to set a cap on occupancy but two adults, two near adults and a grade schooler seems very tight and we're not really ready to have huge water/sewer bills associated with what would be a lot of people in this property. 

Do we have to rent this apt. to this family?  We did not mention a cap on occupants when showing the unit.  I'm fine with families but I don't want to see another room turned in just to fit the extra individuals of differing sexes and ages.  (this is an assumption on my part)