Cassandra Thorburn reacts to family tell-all threat

has barely been out of the headlines since his high-profile departure from Nine in the name of free speech - and now his former sister-in-law is getting in on the act.

This week, Allegra Bottrell-Thorburn, the estranged half-sister of Karl's first wife, Cassandra Thorburn, hinted she is ready to lift the lid on the famous family in an explosive tell-all.

Taking to , Allegra filmed herself as the central figure in a fictional documentary.

She walked into a dimly lit room, sat on an empty sofa, clipped on a pretend microphone and took a theatrical deep breath before the screen cut to black.

Across the video, the text read: 'Me when they make a documentary about how my sister, who was married to Karl Stefanovic, told me [redacted for legal reasons] and the battle we had in the media after our Dad's death.'

She also added the caption: 'I have so much lore, it's insane.' 

'Lore' is Gen Z slang to describe an individual's personal history, background or defining moments that make them who they are.

Furthermore, while the clip initially appeared to focus on her public falling-out with Cass, Allegra made it clear in the comments that Karl would also feature in her version of events.

'He is still my family. He was my brother-in-law for 18 years. I know my family better than anyone,' she wrote. 

But while Allegra appears to be teasing revenge, her sister is in the middle of the biggest fight of her life. 

Earlier this year, Cass revealed she had been diagnosed with occult breast cancer (OBC), a rare form of the disease. She shared the devastating news alongside a photo of her newly shaved head on Instagram.

Since then, she has regularly documented the brutal reality of her treatment with raw and emotional updates.

When contacted by the Daily Mail about her sister's latest post, Cass initially responded: 'I'm just sitting at the radiologist's so this is bad timing.'

She later decided to set the record straight with a statement taking the high road.