The Marble Collector: The life-affirming, gripping and emotional bestseller about a father’s secrets. Cecelia Ahern

in Ma’s case it would be a load of dirty washing. That’s her cross to bear she always says. That and the six of us boys.

      ‘And just in case the bread’s not enough to flush it out …’ Hamish says, taking a bottle of castor oil from the cupboard and grabbing a spoon. He throws off the towel and picks up the bread. ‘Oh, Bobby,’ he sings, dancing the bread in the air in Bobby’s face. Bobby’s eyes light up.

      An hour later I’ve changed two of the most indescribably wettest shits I’ve ever seen and there’s still no sign of the fox.

      ‘You’ve really trapped that fox, haven’t you, buddy?’ Hamish says to Bobby and laughs hysterically.

      He offers another slice of brown bread and spoon of castor oil to Bobby and Bobby says, ‘No!’ and runs away. I don’t blame him and I’m glad. I’m literally up to my elbows in shitty terry cloths. I don’t know how Ma cleans them but I’ve boiled up some water and have steeped them for as long as I could, burning my hands in the process, and have tried rubbing the parts together to get the stains off but nothing. I still think I get the better end of the deal as it’s Hamish that sifts through the poo first with a knife before handing it to me to deal with. If I wasn’t so terrified about Ma coming home and finding the bread gone and a marble stuck inside her precious baby then I’d be able to laugh like Hamish is.

      It is when Hamish is looking through Bobby’s third crappy nappy that I hear the key in the door. Ma’s home and my world ends. My heart thuds and my throat closes up like it’s the end of my world.

      ‘Hurry up,’ I whisper and Hamish sifts through the poo faster.

      The front door opens, Hamish dashes out the back door, and Ma and Angus are greeted by a naked-from-the-waist-down Bobby who’s demonstrating tumbles on the floor, his pudgy legs crashing into everything as he follows through.

      ‘Everything all right?’ Ma asks, stepping into the room.