This is a fascinating and unique take on the Snape is related to Harry story. Very nice so far.
One editorial comment: You routinely use "of" instead of "have" (it should be would have, could have, should have.)
Now, a question... I've always wondered where the name Hayden came from for Harry's brother? So many fanfics use it.
Author's Response: Hi, and thank you.
I chose Hayden for a name becuase way back when I was young, I had indentical twins in my class. Harry and Hayden were their names as you can guess, and so it just came to me. As for why so many other fanfics use it I have no idea. It can't be for the meaning at least, unless having a name that means The Rosy Meadow is some how a plot point....