Jolie slept with Bertrand's lover when she was in high school, starting a lifelong feud between Jolie and her mother that lasted until Bertrand's death in 2007, according to Andrew Morton's new biography about the Oscar-winning actress.
Bertrand's boyfriend lived at home with Jolie and her mother, RadarOnline.com reports Morton writes in the book.
Bertrand died in 2007 of cancer at the age of 56. Jolie was devastated at her mother's passing, Morton writes.
Jolie and partner Brad Pitt made headlines earlier this month when they brought their brood to the Middle East.