Levi Johnston's book is coming out next week, and media outlets are already abuzz about the subject matter: his relationship with the Palin family.

Deer in the Headlights: My Life in Sarah Palin's Crosshairs hits stores on Sept. 20.

The Associated Press bought a copy of the book on Monday, and it seems as though Johnston is disputing several claims made by the Palin family, including Bristol.

Johnston wrote that Bristol suggested they have a baby after her mother announced she was expecting little brother, Trig.

Let's get pregnant, she reportedly told Johnston.

The book talks about when Johnston and Bristol broke the news of their pregnancy to her parents. Sarah Palin thought they were joking, while her husband became angry.

Sarah Palin, Johnston writes, then insisted on adopting the baby to avoid a scandal, but that he and Bristol would not allow it.

Sarah Palin did not want to be called grandma, either, according to Johnston. She wanted to be referred to as Mommy Sarah.

Johnston's account of how he and Bristol became pregnant differs from what she wrote in her own book Not Afraid of Life: My Journey So Far, the AP reported.

Johnston also said he was there when his son was born, along with Sarah Palin, who had denied this in interviews.