Charles shared a birthday wish for Archie, though he didn't post any such message on Charlotte and Louis's birthday.
In one illustration in the book, a red-headed soldier is seen holding his young son aloft while his wife watches from a window.
William also revealed that Charlotte had a "lovely day" celebrating her 6th birthday, and was joined by other members of the British royal family.
William once found being in the spotlight "difficult to deal with when he was younger," but has grown "more comfortable in his senior role."
The blooper was from William and Kate's video message that they recorded for the Irish Foreign Ministry for St. Patrick's Day this year.
Royal author Sarah Gristwood claims that these same courtiers who reputedly once sneered at "Waity Katie" are now "bowing the lowest" to her.
Dame Hilary Mantel said that the British monarchy has become a "self-punishing institution."
The heir apparent had already tried to control the spendings at the weddings of his nieces Princesses Beatrice and Eugenie.
Kate also felt that her would-be sister-in-law Meghan Markle appeared embarrassed about her family.
A body language expert said that William also "did his best to open his body language" toward his younger sibling after their grandfather's funeral.
The Duke of Cambridge currently serves as the president of England's Football Association.
The photo was taken in Norfolk, England ahead of the princess' birthday on May 2.
Prince William and Kate Middleton celebrated a decade of their marriage this Thursday.
Prince Harry served as his elder brother Prince William's best man at the latter's wedding to Kate Middleton in April 2011.
The couple met in 2001 while studying at the University of St. Andrews and started dating two years later.
The Duke of Sussex thought it would be fitting for the Duchess of Cambridge to have his mother's sapphire ring.
Meghan Markle is "over the moon" to have her husband back home with her.
A slimmed-down monarchy would mean fewer senior royals who can carry out royal engagements.
"There was no reason for them to betray the family trust in the way they did," Gary Goldsmith says.
The brothers walking and chatting together after the service "was entirely natural with no sign of stress or discord in their companionship."
The children of the Duke and Duchess of Cambridge, particularly George and Charlotte, are "very upset."
Kate Middleton could potentially act as a peacemaker between her husband and her brother-in-law at the funeral.