<human>: Hello, Legal advice, I need legal advice.  

14 months ago, I bought a house with my now fiancé and her sister.  We each agreed to be 1/3 owners, I paid a 50% down payment on the house, and the remaining 50% was taken as a loan.  My fiancé had the credit, so she is the one who took the loan out.  Her sister decided to put in around $8k for renovations.  Her sister was made part owner because she was coming out of an abusive marriage and she and her daughter needed a fresh start.  We thought that giving them property might help them have something to build on as they began a new chapter in their life.  Our initial house budget was $50k less than what we bought this house for, but since the sister was going in with us, and agreed to stick with it, we decided to take the extra out in the mortgage.

We all agreed to stay with the house until we all felt it was time to sell.  That way, we could all walk away with a profit.  She paid the $750 every other month in mortgage.  So, this past week, the sister decided that she wants to move out and in with her new boyfriend.  This sticks us with a house that is too large for us, and $50k additional debt that we wouldn't have had if we didn't decide to have her move in with us.  The sister is asking us to 'buy her out', although there's not much we can give her, since she didn't put much in.  

Do I have any legal recourse?  I'm now stuck with $50k of debt, which really kicks me and my family in the balls.  Or am I SOL, because I was too damn trusting and generous?

Condense the text into a few key points
<bot>: My sister-in-law is reneging on a verbal contract that puts my fiancé and I in $50k debt.