On Monday (April 6), the teen father of Bristol Palin's son, Levi Johnston, and members of his family will appear on "The Tyra Banks Show."

On the show, Johnston (father of Bristol Palin's son, Tripp) is joined by his mother, Sherry, and his sister, Mercede, and will talk to Banks about being involved with Republican Vice Presidential nominee Sarah Palin's family, the campaign, his relationship with Bristol Palin and the reasons they are no longer together after having a child.

Johnston, an 18-year-old Alaska native, was thrust into the international spotlight last summer when it was revealed that his then 17-year-old girlfriend, the daughter of Alaska's Governor Palin, was pregnant.

On the show, Levi, who was sharing a room with Bristol at the Palin residence prior to their breakup, tells Tyra he believes Sarah Palin knew that the couple were sleeping together and that they practiced safe sex "most of the time."

"I'm pretty sure [Sarah Palin] probably knew," Levi says on the show. "Moms are pretty smart."

Levi's family also reveals to Tyra that they were under a gag order during the campaign.

"When you talk to media, you say something, and they have a twist to make it sound like something totally different," Sherry says on the show.

"We were supposed to say that all questions need be brought up to the McCain campaign," Mercede says. "Other than that, we had to say no comment."

Tune in to "The Tyra Banks Show" today for the full interview.