Wasn't there a graphic novel on the Heroes website about Nathan's dad? I seem to remember it was in War Buddies, and he had a letter from his wife about Nathan. I think that Adam is Nathan and Peter's grandpa, because that would be so much more interesting than him being their dad.
Still...
I hope that the season finale will clear a bunch of things up!
Hey, is Matt's dad Maury still stuck in his nightmare world thing?
Wouldn't it have been cool if Sylar had accidentally killed Maya instead of Alejandro? She is so annoying, but in the episode where we went back four months, she was pretty!