Mia Tindall, three, and TBC (due this summer)

The Tindall children are going to be a big feature of Baby Cambridge’s life. These country urchins will lead their London cousins into all manner of scrapes – and, in the way that only seems to happen with cousins, all ages will interact together to form a tight-knit pack. Mia ( pictured far left, with Savannah Phillips) is younger than Prince George, but much bossier, and therefore head of the royals’ Generation Z. They’ll probably end up at Pony Club camp in Gloucestershire, with the Tindalls taking home all the prizes.