However, the most critical part of the process in establishing an accurate ARV based of good comps.  

.- Another critical thing is NUMBERS.

And yes, I do actually try to put my college degrees to use for critical thinking rather than going to sleep with Leonardo Dicaprio and Christian Bael every night.

NOI is critical for determining value along with the CAP rate. 

Verify the income and expenses these are critical. 

He doesn't seem to handle honest criticism very well.  

I am going to cancel the December meeting next week as I have a critical meeting elsewhere I cannot miss.

The condition of a property is critical.- Not sure if you found this property on Zillow or not, but if you did, here's some Zillow advice-https://www.biggerpockets.com/renewsblog/2016/01/1...- Risk factors?

If their criticism isn't based on logic, and your mom crying seems to suggest its more emotional, then you just have to understand that its probably not sound investment (or life) advice.I think your parents will be ok but it may take some time. 

I would sell it.Unless the cash flow is seriously outsized, it represents a great appreciation opportunity, or you want to build your portfolio further with similar properties, the effort and lack of standardization is going to be a bigger and bigger drag.As you scale, being able to standardize processes (like tenant screening and qualification) is critical.