Everyone's given you good advice, I will have to go back to the thing with the sister haggling though, regardless of what they are saying, it seems really strange for someone else to be making a deal with you. If it came down to it, and it was closing day, they could literally stand you up and you would have no recourse because you've never dealt with the real buyer. Or maybe they are just ****ing with you altogether? I'm so sorry this is happening!