Photograph: Dara Mac DónaillDaughter Number Four’s weekly schedule: swimming club, hip-hop dancing, drama, school swimming, song and dance. So, we were a little surprised and increasingly delighted when we started to realise that Daughter Number Four has an aptitude for it. She’s started to sprout impressive shoulders, and in the water, she’s a rocket. Our delight stems simply from witnessing her discovery that she’s good at something. It’s not that swimming will define Daughter Number Four’s life.