Well. I have no idea how she forgave him (if she did.) If she did, then she is a very wonderful person, and you should be proud. But, the same thing happened to me by my grandfather. I was around the same age as your daughter was. (I am now 16.) I understand the rage you have. I really do. And the best thing to do is (as hard as this seems) : let it go. As long as your daughter is mentally healthy, then you shouldn't worry. And maybe you should tell her that neither one of you owe him a second chance. You don't owe him anything. I hope she doesn't involver herself with him. Forgiveness is fine. But thats all he deserves. Probably MORE than he deserves. If you do end up talking to him, just explain what you feel. Let him know what it did to everyone, especially his little girl, and also remind him what he did to himself. There is no way to come back from doing something so sick and shameful. And perhaps it is better to wait until he's at a distance from where you live.