Not sure how to feel

In my last post I talked about finding out about my dad's death and connecting with his family. I have a hard time grasping the fact that he's been gone for 25 years and I never knew. I always thought eventually I would find him. I never had dreams of a relationship or anything like that but I was sure I'd find him and get to know about him. I'm not sure how to feel about it. How do you mourn someone you didn't know? I haven't allowed myself much time to think about it. It is a blessing to finally have some answers so I should be content with that.