How should my character react?

Question:

How should my character react?

I am writing a book in which the main character discovers that he has a nineteen year old daughter who he did not know existed. I want to know how the character should react. I only need an initial reaction. The next day, the world is overrun with zombies.

Additional Details

3 days ago
Yes, this is a serious question. I'm not giving away any more details, though.

3 days ago
He knows who the mother is.

Best Answer - Chosen by Asker: 3 days ago
Yes, this is a serious question. I'm not giving away any more details, though.