Prince George and Princess Charlotte are tipped to help Kate with Prince Louis in a sweet move. The royal youngster is celebrating his sixth birthday on Tuesday, and his two older siblings will likely be on hand to enjoy the celebrations. Prince George, 10, and Princess Charlotte, eight, live at Adelaide Cottage with their younger brother Prince Louis, who turns six tomorrow. Their mother, Princess Kate, previously lifted the lid on how she likes to celebrate her children’s birthdays. She told Mary Berry in 2019: “I love making the cake. “It’s become a bit of a tradition that I stay up ’til mi…