Dumbledore,+I'm+your+father.

Dear Dumbledore, I know this may come as a bit of a surprise, but you know how things go in the wizarding world. You never know what's going to happen. Apparently, I am your father. I had no idea of this until last week. I'm still not exactly sure how this is so, but now that I know I want to begin to act like a father to you. So, I am very upset about the way that you yelled at Draco. Therefore, I am grounding you for one week.

Sincerely, Harry Potter