Legal Question in Real Estate Law in Missouri

There are many variables that could alter the determination of debt for the payments made. Based upon what you described, the person that made the payments is an owner of the house. As such, they might be entitled to a pro rata partial reimbursement of the mortgage payments they make.

You should consult directly with a civil practice attorney, in your area, to determine liability. There aren't enough facts here, to tell you who owes whom or how much.

Good luck