The question is how much grief you want in your life? What is it worth to be left in peace?

Pay the 700.00 back and he goes away forever........ you gained and lost nothing.

Let it play out, however long it takes, but you have to worry about your stepmother, and have to check on the car. You have to manage your stress and families as you wait for him to do what ever he does.

Or you could be the jerk and hide or move the car and ripe him off, and that could bring reprisal and damage to you and your families property. How much does a window cost to replace?

Pay the guy back and be done with it, just think of it as bonus you got a few a free repairs done.