If the mortgage lender does not receive his payments on time, then he will start the foreclosure procedure. If your name is not mentioned on the mortgage docs, then the lender won't come after you to recover the deficient balance. However, you will have to surrender the property to your lender. If your daughter and her husband wants to save the property, then they can apply for a loan modification. This will help them in getting a better payment plan to pay off the mortgage.
The mortgage lender will start the pre-foreclosure process if he does not receive the mortgage payments for 3 months at a stretch. If you're one of the owners, then as James said, you will have to surrender the property to your lender once the foreclosure process is started.