GOP presidential hopeful Sarah Palin and her family are the subjects of a profile by George Gurley in the September issue of Playboy, according to sources. Insiders say the story will run next to a four-page nude pictorial of Mercede Johnston, the sister of Bristol Palin‘s estranged baby daddy, Levi. The Palins did not participate in the Gurley piece. Instead, the writer went to Alaska to interview locals and friends for a write-around. But Playboy sources say that Mercede is outspoken in the article about Palin and Bristol, whom she routinely lashes out against in her blog. One of Johnston’s latest blog posts rips Bristol’s book, “Not Afraid of Life: My Journey So Far,” saying it should have been entitled, “Not Afraid of Lies.” Sources say Johnston was paid less than $25,000 to strip down for the magazine. A rep for the Palins didn’t get back to us.