With exclusive access to research – the first of its kind – reporter Livvy Haydock investigates what could be the most common form of sexual abuse that happens within families: sibling sexual abuse. She speaks to families struggling to get help for this distressing form of abuse and those struggling to come to terms with a child harming another child – and fighting to repair their family. As she will find out, a lack of official data makes it difficult to know for sure the true scale of the problem but some experts suggest 1.3 million people in the UK may have been affected by it. And she will ask if a reluctance to accept what’s going on in front of us, could mean that when people look for help, often, it’s not there. This is a story about sexual abuse at the very heart of the family; a story that may challenge what you think you know about the risk children may face in our homes. Reporter: Livvy Haydock Producer: Alys Harte Technical Producer: Craig Boardman Journalism Assistant: Tim Fernley Production Manager: Sarah Payton Editor: Nicola Addyman