That may be where the discrepancies in the Mortage payement, selling and purchase prices of their house come in. They may have refinanced or taken a second mortage to help fianance his buisiness. If so they wouldn't be the first people to do that.
I hate to be judgemental here, but if you are making in a year, nearly the price of your home, you should not be in such trouble.
If they put 25% down first, on the $114k, they would have only needed an 88k loan. Pay off $1,500 a month on that, and even with interest, they would be free and clear in under 10 years.