But let's say the median value of your relative error (as you compute it) is 5%.

With a few mouse clicks anyone can find out where you live, what you own,  your cell phone number, your relatives’ names, and more.

If so then when it was settled the property was given a "step up" in basis so you inherit it as if you paid market price when your relative died.  

What you need to do is hopefully go to the lender's website (that your relative was using to pay the mortgage) and just make payments to the bank. 

What is your relation to Donna, her course, or her company?

Just remember this keep a smile on your face and treat them like they were your relative or someone you knew for a long time and that will make them open up to you and discuss there problems if they see you generally care.

Sarah, do your relatives have any other debts or savings?

Let's assume that your relative is going to put up the money for you to buy a property that has a great potential profit.I would suggest that he is co-purchaser with you - with a simple agreement that he gets 30% of the NET PROFITS - make sure it is NET!

There is NO 5% money unless its your relatives lending it to you.. that on its face is showing you they are frauds and fake lenders full stop. 

Probably easier to just avoid discussing your real estate business with them; it would be so much nicer for you if they would support you, but as they say, you don't get to choose your relatives...