Like children up and down the country, Prince George, Princess Charlotte and Prince Louis will be honouring their mum the Princess of Wales.
It's likely they'll all be marking Mother's Day today, and no doubt the youngsters will have some treats in store for Kate.
But as well as saying thanks to their mum and their grandmother Carole Middleton, they will also have their other granny, Prince William's late mother Princess Diana in their thoughts.
