Such a busy week in real estate....parents listing expires and nobody read the Listing Contract or asked the realtor AND ON THE VERY SAME DAY the lot you have or maybe are going to buy may or may not be the down payment for the house you may or may not build but nobody has talked to a Loan Officer.
Some basics will go a long way here:
#1) Read the paperwork. #2) Talk to you: a) Realtor b) Lender
Finally, Matt....was your parents house even listed? Do you even own a lot? Or just the 2-flat?