When she was growing up, if Sienna Scully walked past walls, she would have to touch them — otherwise, she believed her mum would die.
At the time, her mum was fit and healthy, but Sienna's obsessive compulsive disorder (OCD) made her believe if she didn't carry out certain "rituals", her worst fear would come true.
"From the very, very beginning of my memories, I just had this irrational fear — I'm going to lose my mum," Ms Scully said.
