I did a photo session with a family that had 10 month old twins. So of course I had one of the parents sign two model releases for both of the babies/kids. Long story short, I won't sell them a CD that they can print off of so the parents won't buy any prints and they want the model releases back. I won't give them the model releases back and they're saying the parents have the rights to take back the releases and they're getting a lawyer to get them back. Do the parents have the rights to take back the releases? And either way, any advice on what to do about the lawyer situation?