Very difficult situation. I made a personal rule a long time ago, that when dealing with family, and friends that are like family, to either give them the prints that they want for free, or to not do anything. It is my gift to them, or nothing at all. And if they take advantage of me and they are family...that is what family is for. If they take advantage of me and they are a friend...then they are not much of a friend.
Everyone is different, so you have to do what you think is right.