If it is, explain your situation and ask to file a complaint.

About two weeks later, the appraisal came back with a value that was off by approximately 35%, leading the lender to reject the loan.I contacted the lender to explain why I believed the appraisal was flawed.

Can someone explain the details of selling a house to a child?

I appreciate you taking the time to explain this thoroughly. 

Sellers are always going to look at more money down more favorably unless the agent explains the why behind doing the FHA, especially in a competitive market.

Be ready to explain the benefits and address concerns confidently.

It is somewhat complex to try to explain on a forum, but at a high level, you (aka GP) and your family member (aka LP) would agree on how much the 2 of you would put in for the amount of equity needed (usually expressed as a %).

I had to explain to her that when I rent from you, I have temporary owner's rights and you can't just walk into my house whenever you want.

Drive around the neighborhoods to understand the lay of the land - if you have someone who will take you around and explain, better yet. 

Let me explain...Houses naturally have an aesthetic to them when they are first built.