Prince George has an adorable nickname for his great grandmother Queen Elizabeth II. The two-year-old calls his great grandmom “Gan-Gan.” Kate Middleton, the Duchess of Cambridge revealed the details during her first-ever solo interview.

The mother-of-two opened up about her kids George and Princess Charlotte’s loving relationship with their great-grandmother. “George is only two-and-a-half and he calls her ‘Gan-Gan.’ She always leaves a little gift or something in their room when we go and stay and that just shows her love for her family,” said Kate.

The 34-year-old royal gave a special interview to mark Queen Elizabeth’s 90th birthday in April. The interview is part of a documentary on the longest reigning monarch. Titled “Our Queen at Ninety,” the ITV documentary airs on Easter Sunday, March 27.

Apart from Kate, her husband Prince William and Prince Charles and his wife Camilla, the Duchess of Cornwall has been interviewed for the two-hour documentary. The brunette beauty, who married into the British royal family in 2011, said how the 89-year-old has been very supportive and gave her gentle guidance towards being in the public eye.

Royal duties are not only challenging for those who grew up in the fold, and the queen understood that it’s harder still for those who are new to walkabouts and state occasions. And who can best vouch for it but the duchess herself. She added that a walkabout is an art and she is teased by family members regularly for spending too much time chatting with people.

Kate said she still has a few things to learn and pick up a few more tips. Recounting an engagement on March 8 in 2012, the first day of the queen’s Diamond Jubilee tour of the United Kingdom, she said she was very apprehensive about it. Kate went for the engagement minus William but was joined by Elizabeth and Prince Philip in the East Midlands.

The princess gushed about the queen and added that Elizabeth was very supportive and made sure that she was happy and looked after. Kate said it showed how small things about her family matter to the queen and also that she is caring.