"Have you called to make sure you --"
The eldest teenager put up a warning hand.
"Mummy," she said, "You don't need to remind me. In fact, you're not allowed to remind me. I'm a legal adult now."
"I know, darling, but I --"
"Nope," she said kindly but firmly. "You have to trust me. I can handle things on my own."
I smiled in a sheepish, pained sort of way and pressed my...