Could the answer lie in the past? The BBC’s social media investigations correspondent, Marianna Spring, continues investigating what happened to Paloma Shemirani. She speaks to Paloma’s brothers to see if the answers could lie in the house they grew up in. Who is Paloma’s mum - prominent British conspiracy theorist influencer Kate Shemirani - and how did her beliefs evolve and impact Paloma and her siblings? Could her mum’s conspiracy theory views have influenced Paloma’s decision to reject chemotherapy?

Host: Marianna Spring Producer: Anna Harris Story Editor: Matt Willis Sound Designer: Tony Churnside Editor: Sam Bonham Commissioning producer: Nathan Jones Commissioning editor: Rhian Roberts This was a BBC collaboration with Panorama. Watch Cancer Conspiracy Theories on iPlayer now.