I agree with the previous poster.Also, to alleviate this concern with his next tenant, I suggest your FiL contract to begin service with the garbage collection company, increase the rent by the amount of that cost, and then market the house as "comes with garbage collection!"

The seller has offered a 2-year option, but the purchase price seems a bit steep given the limited data.

What about carrying the note and collecting payments that way?

Finally, I collect completed applications with photo ID and trans union smart move. 

I use the Pro plan so that I can capture each data set they respond with and use a FB page for my rental company.

I would personally pick option C.Place tenant myself and self manage for the following reasons:I don't like giving away 10% of my rents.No one is going to care about my property more than me.I have systems in place that allow my to self manage with minimal time.I have a great support staff that I can text when there is a repair that is needed.I rarely take calls from tenants and tell them to text me to keep from getting caught up in their drama.If they don't pay rent on time and it is a repetitive problem I file an eviction to train them they must pay on time or go somewhere else.They can pay rent with Zelle, paypal or deposit rent into my bank account (most deposit into my account)It is their job to pay rent on time I do not collect or chase rent it comes to me.My rental portfolio is very passive with little interaction required by me.

@John Dorma you should think through the income and determine what you believe you can collect.

And the second family, although they also have low credit scores, the score is based on the fact they don't use credit they do have some collections but the debit amounts are very low.What kind of CMA work do I need to do before I deny the first family? 

https://www.homedepot.com/p/Home-Decorators-Collection-Stony-Oak-Grey-6-in-x-36-in-Luxury-Vinyl-Plank-20-34-sq-ft-case-60198/207047495It looks really great with repose gray walls and bright white trim.  

For an alternative real estate source try this link: https://retipster.com/real-estate-data/Besides Listsourse there's AgentPro247, ReboGateway, Melissa Data and RealQuest..