Welcome to the board, just a few suggestions:
1. Read the advice to "newbies" post that Sandy set up, it is very imformative and very usefull.
2. Try and read all the "HP" related topics that have been posted over the last few pages.
This topic has been so discussed that I know, you will find it repeatedly, back a few pages. Many people(on this board) have come to the decision that Evans, is just a coincidence. If Evans is related to Harry, it is distant.(for Mark is Not petunia's nor Lily's son). You also have to remember, Lily was muggle born. Therefore the chances of Mark being a wizard are slim. And lastly, How many times did harry escape Dudly when he was a child? He was a wizard, and he seemed to find the "wierdest" ways to escape, why couldn't Mark.
Another little tidbit, there has been a certain person, traipsing around this board under about 100 different names, if you are her(and i am not saying you are) stick to the rules, and everyone will like you...
Again, Welcome to the board.
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein (1879-1955)