I'd suggest doing whatever you have to do to not lose this buyer. Even if that includes taking a bit of a 'hit' on your settlement and just be done with this mess. My exwf owes/d(?) me over $40k in back child support that grew through the years,but I didn't care. It was worth it to not have to deal with her craziness for the last 13yrs of my daughter's childhood and my sanity.