Well, unfortunately this is not an uncommon situation. It is possible that the contract is enforceable, but it is just as possible that there's room to get out of it. Also, I can't tell from the description what they had you sign, but I'd be hard pressed to find a way for them to hold your signature against your mother-in-law. Generally, I'd point you to the termination clause of the contract, but here it looks like there are a few auxillary issues present. I would highly suggest that your mother-in-law have the contract reviewed by an attorney... and potentially hire an attorney to negotiate a way out.
Answered on Jul 17th, 2015 at 12:25 PM