Molly and Her...Son

Nearly half of the naked man's DNA matched Dr. Phillip Castellano's daughter's DNA. Impossible. The man was nearly as old, or older than Molly herself. She wasn't born pregnant. How could this have happened? He and his partner on this project, Dr. Ken Whitten, wrote papers on it, but Molly and her...son were the only existing examples. There were familial semblances to Dr. and Mrs. Castellano, as Molly's parents, naturally, but only as far as grandparents. Molly was an only child and Dad had been there the whole pregnancy; there was only one fetus�Molly. How could this have happened?