In front of me is a cardboard packing from a gift. A wavy dividing line drawn in biro. Good: Rosay, Sophie, Megn. Bad: Claudia, Robin. The list was drawn up by Alfie aged seven, and Tilly, aged five (her birthday today). Rosay has just turned one and is Robin’s sister. She can’t be bad because she’s a baby. Claudia is bad because she’s Alfie’s sister. Megn, aged six, is a neighbour’s kid that runs really fast and told me she doesn’t really need...