I hope you have luck with that MotD. I remember reading something about not meeting you dad, somwhere or another.
As for me, I've always known my father, but he recently died (Septemeber 2004), and no, I don't want sympathy or pity. At the time of his death, I was happy he died, same with my grandmother (January 2001 is when she died).
My dad had serveral problems, such as AID's, a brain disease and a few others. It was fatal for him. He was reduced to living on machines, stuck to a hospital bed 24/7 and only being able to eat ice cream, of course, my dad always ate alot of ice cream. When he died, I was happy for him. He was finally going to see his mother.
As for my grandmother, she was even worse of. I forgot what she had, specifically, but she also had lung cancer, which, combined with the disease, disentergrated all of her left and almost all of her right lungs. She also couldn't speak or move, much. She barely even ate. She was also living off machines like my dad.
Now, they are reunited in death, buried besides each other in SouthWindsor, Conneticut. I also moved back to Conneticut recently.
Back to the original topic, like Spydey said, it might cause problems with his new family, if they didn't already know about you. It is possible he told them about you, but also equally unlikely. You could speak to him, if you like, or e-mail him, if you don't want to cause him problems with his other family.
It also means you have 4 half-brothers and sisters.
P.S. If you give me smpathy and pity, I'll beat you over the head with an overly large, smelly, blue fin tuna.