ET's Kevin Frazier exclusively goes one-on-one with Levi Johnston, the father of Sarah Palin's grandchild, who tells Kevin what he'll be watching for in Sarah's sit-down with Oprah on Monday!

Kevin asks Levi if he thinks that anyone who watches the Nov. 16 interview or reads Sarah's book, Going Rogue, will believe her. "I doubt it," Levi says.

In a clip of the upcoming interview, Oprah asks Sarah if Levi will be invited to the Palins' Thanksgiving dinner -- Sarah chuckles and replies, "Y'know, that's a great question."

Levi, in turn, tells Kevin that he'll be watching Monday's interview "to see the answer to that -- the rest of the question."

He adds that Sarah hasn't invited him to Thanksgiving dinner yet. "I could care less to go with Sarah Palin, but I want to be with my kid," he says. "And I'm here to tell you it'd probably be a little weird, it would be uncomfortable, but I would probably do it."