[15:28] Prince George of Cambridge talks to Queen Elizabeth
Prince George of Cambridge talks to Queen Elizabeth outside the Church of St Mary Magdalene on the Sandringham Estate for the Christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England. Reuters/Chris Jackson/Pool

Ever wondered what Prince George calls his famous grandmother? To everyone, she’s Queen Elizabeth II, but for her youngest heir, she’s simply “Granny.”

Or perhaps she is “Nanny,” depending on what Prince William said to his son as they walked from the church on Sunday. It appears William have revealed to the world what George calls his great-grandmother during that momentous stroll.

In the clip obtained by the Mirror, the family of four — including Duchess of Cambridge, Kate Middleton, and the littlest royal, Princess Charlotte — were walking from the church after Charlotte’s christening as the crowd looked on from the side. George was dragging behind to look at the rest of the Middletons and the royals, who were following them from a distance. This prompted his father to assure him that the rest of the party were coming.

“You coming, they’re coming. We can go back to granny’s,” William told his son, most probably referring to the Queen as granny. They were heading back to the Queen’s Sandringham house after the ceremony. The tabloid couldn’t decipher, however, if the 33-year-old prince said “granny” or “nanny.”

The Queen, of course, isn’t George’s grandmother, but his great-grandmother. However, it is believed the family dropped the “great” to make it simpler for the almost 2-year-old tot to call her. Kate’s mother, Carole Middleton, is thought to be called “grandma” by George.

William and his brother Prince Harry also call their grandma “granny.” The brothers have been heard referring to her as such in several occasions.

The royal family gathered at the St Magdalene Church on Sunday for Charlotte’s baptism. Around 3,500 people gathered to watch from the paddock, but the ceremony itself was only attended by a few royals and friends. After the ceremony, the family and their guests walked back to the Queen’s Sandringham estate for perhaps an afternoon of tea.

George, meanwhile, helped another retailer sell out an outfit. The red shorts and embroidered shirt he was wearing at the christening, a near-identical outfit of the one William wore when he was about to meet Harry for the first time in 1984, has sold out from British designer Rachel Riley’s shop. According to Telegraph, the £85 ($177) ensemble is not available anymore in 12 month and 18 month sizes. The smaller sizes in three and six month are still available, though.

Contact the writer: a.lu@ibtimes.com.au