The Duke and Duchess of Sussex were at Clarence House prior to joining the royals for a Thanksgiving Service on June 3.
The Duke and Duchess of Sussex returned to the U.K. for the Platinum Jubilee celebrations with children Archie and Lilibet.
The Duke and Duchess of York still live in the same house at Royal Lodge after their divorce in 1996.
Prince Charles and Prince William lobbied against the Duke of York's appearance at the ceremony.
The Duke and Duchess of Cambridge are parents to Prince George, Princess Charlotte, and Prince Louis.
Charles Rae said there are some people at the palace who want to reinstate the Duke of York's military titles and patronages.
The Duke and Duchess of Cambridge did not publicly mingle with the Duke and Duchess of Sussex during the Platinum Jubilee.
The defender may take legal action against those spreading slanderous reports about him.
The Duke and Duchess of Sussex introduced their daughter to Her Majesty on June 2 after Trooping the Colour.
The Duke and Duchess of Sussex were booed when they arrived for the Thanksgiving service at St. Paul's Cathedral on June 3.
Queen Elizabeth II stripped the Duke of York of his royal patronages and military titles in January this year.
Neighbours, the Australian soap opera that launched the careers of Kylie Minogue, Margot Robbie, Guy Pearce and all three Hemsworth brothers, shot its last episode on Friday, wrapping the country's longest-running television drama after four decades.