updated 08/09/2011 AT 10:00 AM ET
•originally published 08/09/2011 AT 4:30 PM ET
The war of words between two of Alaska’s best-known families, the Palins and the Johnstons, is heating up again.
Following in the barefoot steps of her brother, Levi Johnston, who last year posed for Playgirl, Mercede Johnston, 19, goes nude in a four-page pictorial in the September issue of Playboy (on newsstands Friday), and slams the entire Palin family in the accompanying Q&A.
Mercede calls her brother’s ex-fiancée Bristol Palin a “sociopath,” and claims Sarah Palin used Levi as a pawn during the 2008 presidential campaign.
“She literally took Levi from a hunting trip and flew him to the Republican convention,” Johnston says of the former vice presidential candidate. “He didn’t have a choice. She doesn’t care, as long as she’s going to the top. But it’s screwed my whole family up. Levi was a prop, and once they didn’t need him he was out the door.”