Alaska Gov. Sarah Palin is firing back at her grandson's teenaged father, Levi Johnston, for comments he made on TV about the circumstances surrounding his son's conception.

On an episode of "The Tyra Banks Show" to air Monday, Johnston, 18, claims that Gov. Palin did not think that he and her daughter Bristol were being abstinent when they were together.

"Bristol did not even know Levi was going on the show," Palin's rep tells People.com. "We're disappointed that Levi and his family, in a quest for fame, attention, and fortune, are engaging in flat-out lies, gross exaggeration, and even distortion of their relationship."

"Bristol's focus will remain on raising Tripp, completing her education, and advocating abstinence," the statement reads. "It is unfortunate that Levi finds it more appealing to exploit his previous relationship with Bristol than to contribute to the well being of the child."

People.com says the statement concludes: "Bristol realizes now that she made a mistake in her relationship and is the one taking responsibility for their actions."

Bristol gave birth to Tripp Easton Mitchell Johnston in December, only a few months after her 18th birthday. Earlier this year, it was reported that she and Levi had broken up.