I rented a house to two sisters who ran a small party planning business.   

Originally posted by @Maria Keating:Call the tenant. 

She works for her real estate agent sister and her husband fixes planes and is working on his license, so steady jobs.

My sister married into a Greek family and I never could figure out why none of them drink much and why the rest of us receive the stink-eye when we do.

I grew up in Denver and my Mom and sister have since relocated to Vegas so I've spent lots of time in both of your cities.  

I believe Provo’s ordinance reads (Provo Code 14.06:)"“Family,” unless otherwise expressly provided in this Title means:(a) One (1) individual living alone; or(b) One (1), but not more than one (1) at the same time, of the following groups of individuals described in subsections (i), (ii), or (iii) who together occupy a one-family dwelling unit as one (1) nonprofit housekeeping unit and who share common living, sleeping, cooking and eating facilities:(i) A head of household and:(A) All persons related to the head of household as a parent, child, grandparent, grandchild, brother, sister, uncle, aunt, nephew, niece, great-grandparent or great-grandchild by blood, marriage, adoption, guardianship, or any other duly authorized custodial relationship; and(B) Not more than two (2) additional related or unrelated persons, including but not limited to, personal care or personal service providers; or(ii) In R1 zones located within neighborhood areas described in Subsection (c) of the definition of “baching singles” in this Section, two (2) related or unrelated individuals and any children of either individual, if any; or(iii) In all other zones, three (3) related or unrelated individuals and any children of either individual, if any."

My sister and I are looking to make a deal with a seller who is willing to do an on land contract.

@Maria McCrelessThank you for the insight, SmartMove is the background check tool available here on BiggerPockets. 

Except, their friend moved in for one month and then moved out again because her sister was giving her a free place to live (something like that). 

(My sister bought a vehicle on the "smart-buy" plan and about fell over when I told her that was a lease.)