He determined the price and terms for the property, and according to the agents involved, he consulted with accountants and attorneys before signing the contract.

This allows you to test all the systems and the people involved.  

I think it speaks volumes regarding your care to the situation the heir is involved in.

In the Bigger Pockets free book, "Real Estate Rewind", as one of the 11 co-authors I wrote about one such Tax Sale purchase and made money but not enough money to warrant the risk involved.

If they fail to comply, you may need to involve legal counsel or contact your state’s real estate commission.Hire a Reliable Manager: Finding a professional, responsive property manager is key.

I just want to be involved and learn more so I could achieve more eventually.

Depending on where the property is and the lender involved, and what he has told the lender, and so on and so on, you handle things accordingly.

Leverage magnifies return. 3) The effort involved in adding an ADU is comparable or larger than a rehab associated with a BRRRR.

@Brad Kanouse I have an idea that doesn't involve drawing from your IRA.

My point is this, I am actively involved/advising this investor, providing local vendors contacts (handyperson, surveyor, painters, etc) and I "don't wait for them to call me", I call them weekly.