Do not give them any money until all of there belongings have been removed from the unit.You may want to check out the Chicago Creative Investors Association (CCIA). 

I think you'll be hard pressed to find a city or town in Florida that regulates against a weekly rental,  but you will find a lot of HOAs that are against it, so I would look at your most popular places, check the local regulations, then when you start looking for property check the Association rules. 

So, what problem does this family have now that neither they nor their associates have solved?  

A visit to your local REIC or professional housing association should provide you a referral or two.

There is a Texas Association Of REALTORS Form (TAR- 1410) that addresses the Termination of Listing Agreement between Broker and Seller . 

It is interesting that most of these predictions are disasters, not benefits, and many are associated with financial gain for the prognosticator in the form of a book or seminar.I recently came across two ads almost in sequence.  

Welcome @Michael Douglas Christensen Another great resource is the Utah Real Estate Investors Association.  

You will have to engage and meet with local nearby civic associations and surrounding HOA's and adjacent property owners?

You could also ask a local lender to see if that particular condo association has been approved for conventional financing.

North Texas Association of Real Estate investors has quite a few meetings http://ntarei.com/events/month/I have friends who say positive things about Dalls REIG  https://www.dallasreig.com/I generally try later the programs we're they're pitching a 10 to 20K Secret success program.