This is making me giggle again. Image Kevin's and Castle's faces when they realize that a) Kevin's Castle's dad, b) Martha didn't even say once "Oh, Ryan, my darling, you remind me of someone I once knew.", c) that he also might be Sylar's dad or grand dad (couldn't be bothered to go back and check whether Gabe's dad's name was, by any chance, Samuel and/or if his mom's name fit Konrad's late wife)