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If you look at a photo of x-42's father, named Blythe (can't think of his first name), it's obvious that Chelsea inherited that man's looks. She's the image of the Blythe grandfather.

Do not concur. From a Pennsylvania newspaper (1998):

Who Is Clinton's Father?
The N.Y. Daily News reported that Rush & Molloy's lead item asks who Clinton's father really is. This much is known. Clinton was born to a woman named Virginia Cassidy of Hope, Arkansas. The official biography claims that an intinerant salesman named William Blythe married the young Cassidy, and was the father of William Jefferson Blythe, who was born on August 19, 1946.
Rush & Molloy quote David Maraniss, a Washington Post writer and author of the 1995 Clinton bio "First in His Class." Maraniss notes that nine months before Clinton was born, Blythe was serving with the Army in Italy. Blythe only returned states' some six months BEFORE the birth. Get the picture. Clinton's mother was asked about this anonmaly and her response was Clintonesque. She told reporters back in 1992 that she wanted Bill so badly she "pushed" hard for an early labor.
Maraniss now tells Rush & Molloy that after the publication of his book, he was contacted by a Louisiana family. Family members claim that one of their male relations had a love affair with a young Virginia Cassidy at the time Clinton was conceived. The Louisiana family knew too many details about Virginia to have made up the story. "I don't think it was a fraud," Maraniss tells Rush & Molloy.
That's one theory. Folks in Hope have been talking about Clinton's real father for quite some time. If you visit the town's museum, housed in an old railway station, several pictures appear of Virginia with a man purported to be her husband William Blythe. When one visitor remarked that the older Blythe just bore no resemblance to the reputed son, the docent in charge suggested to the visitor in an ironic tone, "You just keep looking at that photo, you'll find all sorts of resemblances ..."
Another writer who couldn't find any resemblances was the American Spectator's R. Emmett Tyrrell. Tyrrell wrote in his best-seller "Boy Clinton" that one theory about Blythe's fatherhood goes like this: Virginia had an affair, one of many, before marriage. She got pregnant. She had her baby. Back then, having an out-of-wedlock baby carried a stigma. To solve that problem, one of Virginia's family or friends at the county morgue found someone of her approximate age who had died recently. Virginia was "married" to the man. As it turns out, Blythe died shortly before Clinton's birth in a car accident near Hope.