What if he is dead?
What if he doesn't want to think about the fact that he has children as a result of his donations?
What if he thinks about it, but doesn't care?
What if he thinks about it and it all seems too hard, so he just doesn't even bother?
What if I make contact and he chooses he would rather not know me?
It's all too much some times, and maybe ignorance is bliss...............