[Slowly, Vincent approaches and sinks into a kneel in front of Sephiroth after the boy sits. The last question has always tormented him, because he knows that the two possibilities end with a terrible answer no matter wat. So, he remains truthful.]

I don't know who your father is.

[That's out of the way at least. Vincent is at a loss of how best to handle this, but he wants to give Sephiroth the information he has been denied all of his life.]

For as much as she was dedicated to her projects, your mother was not a heartless woman, Sephiroth. And much of her influence was drawn by Hojo. [lol no vincent stop putting lucrecia on a pedestal ahhh] I was told that she died giving birth to you. I was... not there myself, as much as I wish I could have been. I tried to find her, and I was never successful. So... it is possible that is what must have happened.

I am... sorry I could not do better by her. Or you.