An explosion of giggles erupted from the living room. Peeping round the door, I looked on as my eldest daughter, Millie, then six, shook with laughter as she watched my youngest, Link, just 14 months, lie down on his four-year-old sister Sophie’s back as she tried to squirm free.
It was March 2019, and I revelled in the happy sound of my three children playing together. Millie had badgered me and her dad, Bradly, then 40, for over two years to give her a baby brother.
But a month on, in April 2019, I noticed a small lump at the top of Link’s right thigh, just under his bottom. It was the size of a
