Of course, there is yet another possibility, depending on whether or not Angela is a precog, and just how her ability shows itself.

Hm. That would be a sucky power indeed, if it manifests itself like Dr. Manhattan's. I'm not too sure she is the one with the precognition though. (It's always like Russian Roulette with Heroes: Who gets the Amnesia, who gets the Precognition...) I mean, if she were, shouldn't she have foreseen that Nathan would help D.L. and Jessica to kill Linderman? Shouldn't she have been prepared that Claire jumped out the window and that Nathan in the end would abandon the plan and help Peter?
Of course Peter had to get the power from someone, and if it isn't her it has to be his Dad (pro: depressive, contra: not around much to get powers from; pro: it's seriously evil if the first power Peter naps is his father's) or it has to be Charles (pro: walks through dreams, contra: we don't even know if that was a dream in the end, contra: if it wasn't a dream but time travel he simply could have seen Peter because he's an empath himself).

I remember some people during the hiatus speculating that she does that because she figures out his knowing about Nathan's accident means he manifested, and she doesn't want that

She knows that he knows about the accident because Nathan phoned both of them, she even says so in the conversation (I think they mixed that up a little in Six Months Ago, but he definitely plans to call her as well). Besides, why shouldn't he know about the accident, it would simply be odd if he - or she, for that matter - knew that the accident had been an attack, and he never mentions that.

*marvels again that Nathan and Peter aren't even more dysfunctional* I think the age gap was what probably prevented the boys from doing the usual thing and becoming rivals as the result of that, which is what favoritism by a parent usually results in. Instead, you get the idea that if there is any rivalry, it's between Angela and Nathan about Peter, and might have been between Peter and Dad about Nathan.

Their meals must have been a joy to behold. Peter would snap at his father for something, his father would either yell or get very silent, both would look to Nathan for support, Nathan would squirm and try not to pick sides, but tell Peter later that he has to respect their father because he could get suicidal a heart attack again, and Angela would later take Peter aside and tell him that he's her nice little boy and that she loves him best, and that he shouldn't pay attention to his father and brother, who just don't understand him. I think they would have driven any shrink insane...