WOW that is really messed up. Honestly its their money so they can do what they want with it but I really don't agree with how they handled. Basically they spent their life savings moving your SIL to Florida to be near her and her kids and she is going to pick up and move - leaving their bank account empty and they STILL don't get to see their grandchildren
I would be LIVID and my husband would be as well! Thats BULL!