The 96-year-old monarch has pulled out of several royal engagements because of problems with her mobility.
The Duke and Duchess of Sussex reportedly had six security threats at their home in the past 14 months.
The Duke and Duchess of Sussex returned to the U.K. in June for the Platinum Jubilee celebrations.
The Duke and Duchess of Cambridge are said to be moving their family to the four-bedroom Adelaide Cottage in Windsor.
A palace source claimed that Queen Elizabeth II "detests" the Duchess of Sussex for tearing Prince Harry away from the royals.
The Duchess of Sussex turned 41 years old on Thursday, Aug. 4.
The Duke of Edinburgh died on April 9, 2021, in Windsor Castle at the age of 99.
After Barbados, St. Vincent and the Grenadines could become the latest Caribbean Commonwealth country to remove the Queen as their head of state.
Not being on the Buckingham Palace balcony has reportedly left the couple "very angry" and "very annoyed."
The Duke and Duchess of Sussex will reportedly not travel to the U.K. over the summer.
A Balmoral staff said the visit will give the Duke and Duchess of Sussex more time to spend with the monarch after Jubilee.
The Duke and Duchess of Sussex dated for a year before they married on May 19, 2018, in St. George's Chapel.
It was wrong to hold a secret hearing which decided that the will of Prince Philip, Queen Elizabeth's late husband, should be sealed and kept private for 90 years, lawyers for a newspaper told the Court of Appeal in London on Wednesday.
The Duke of Sussex was reportedly left furious after his request to appear on the Buckingham Palace balcony was denied.
The Duke of Sussex allegedly pleaded with the monarch that he and his wife be allowed on the Buckingham Palace balcony appearance.
A new book claimed that the Prince of Wales and the monarch had "urged" the Duchess of Sussex to reconcile with her father but she refused.
There are concerns that the contents of the Duke of Sussex's memoir could damage the reputation of the monarchy.
The British royal family traditionally spends the summer holidays in the Scottish Highlands at the Queen's Balmoral estate.
The Duke and Duchess of Sussex accused a senior royal of being racist in their first Oprah interview in March 2021.
The Duke and Duchess of Sussex returned to the U.K. in June to celebrate the Queen's Platinum Jubilee with the royals.
The Duke and Duchess of Sussex were met with a mix of boos and cheers when they arrived at St. Paul's Cathedral for the Thanksgiving service.
The Duchess of Sussex allegedly bullied aides and reduced some to tears during her stay at Kensington Palace in 2018.