I second everything @Sandor Lau said above, communication and property care has been excellent. 

If you have clearly communicated your requirements to the prospect, then they are simply not adhering to them.

Working with a business partner highlighted the importance of clear communication and shared goals.

I would work on my communication of my processes including letting them know asap of their schedule with me. 

We've found it has superior reporting features, integration features, and is overall more efficient to work within than other REI-specific software.The downside is QBO is not set up for REI so you'll need to do that or work with an expert to ensure it is set up for your business appropriately.

In my experience, a successful BRRRR typically comes down to two main things: finding a good deal and managing an efficient renovation.

Quote from @Roni Williams: Their communication is non existent.

Communication with the tenants is key.

Also, clear communication with your parents about goals, risks, and expectations will also help avoid tension.

Chances are that an engineer would be the most time efficient way of getting the info.