Following Prince William and Kate Middleton's wedding, King Charles assisted his step-granddaughter Eliza on Buckingham Palace's balcony.
Following the birth of Prince George, Charles began collecting gifts for his new grandson.
He appeared pleased to receive a teddy bear for George at the Sandringham Flower Show in 2013.
Charles, his eldest son and grandson, and the rest of the royal family baked a Christmas pudding for military veterans in 2018.
When military planes flew over Buckingham Palace during this year's Trooping the Color, 4-year-old Louis appeared to be scared.