Its not in your place to insert yourself into any of this. This is not your decision to control or have an opinion over for you are NOT his parent - and he will eventually hear the other side of the story whether or not you like it. It's inevitable as long as they are both alive. And if you or your daughter try to interfere, control, deceive or manipulate him from seeing/contacting his father in any way he will eventually turn this anger onto the both of you and probably cut you both off as soon as he turns 18. He has very right to want to reach out to his dad, and get answers to the questions that he knows ONLY his father can answer. But if you shield him from this quest, you'd better hope and pray that nothing happens to father before he gets to hear the other side of the story, gets his questions answered or finds some form of resolution to the anger that you say he has. And from your responses alone you seem to KNOW how and where to find his father online - but choose to withhold this information from him, meaning you ARE blocking his access to his dad, whilst "preparing him for what will be said." Sounds so controlling and almost brainwashing to me. Let that boy talk to his father and decide for himself - without any outside influences - what kind of a man his father is. You are all playing mind games with this boy due to fear of what will be said and you know it. Eventually he will just sneak out and see his own father, and build a relationship with him and if he wants to even leave your home and move in with him for that's his right to do so and you can't take it away. 
