There is an interesting thread on the topic currently ongoing.
It just struck me as I was reading your comment, that this, if it were proven true, is actually just about as explosive as verification of constitutional ineligibility. Almost. It certainly could result in just about as much civil strife.
I can think of at least one person however, who would probably be mighty pleased not to be the #1 political sexual joke byline anymore:
"Hey, at least I'm not the byblow of a pedophilic, Marixist pornographer on an underage floozy."
found this on the net- i have no idea how true it is, but this says stanley ann dunham was married to jackie chun juanie and had (2) children -you ever heard of this?
http://www.geni.com/people/Jackie-Chun-Juanie/6000000004017885834