Baby Archie has helped mend Prince Harry and Prince William’s relationship, source says

Baby Archie is bringing the royal family together.

Royal expert Katie Nicholl tells ET that while there had been a rumored rift between Prince Harry and Prince William, the littlest royal is mending the brothers' relationship.

"It's absolutely the case that the brothers did fall out," Nicholl says. "I was told by a very senior royal source that actually they weren't talking to each other at one point. I certainly think now that Archie is here, it has probably really helped to improve the relationship. William is over-the-moon that his brother is a dad."

There had been reports that Harry and Will were not exactly on the best of terms. Last December, a royal source told ET that "tension does still exist" between the brothers after the Duke of Cambridge originally voiced his "concerns" about Meghan when she first started dating Harry. According to our source, the conversation didn't go over well with Harry, and they still had "not mended completely." Then at various events earlier this year, there was obvious distance between them.

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First photos of Baby Sussex
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First photos of Baby Sussex
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
Britain's Prince Harry and Meghan, Duchess of Sussex are seen with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle, in Berkshire, Britain May 8, 2019. Dominic Lipinski/Pool via REUTERS
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Meghan, Duchess of Sussex, places her hand on the head of her newborn baby boy as she and her husband Britain's Prince Harry, Duke of Sussex, pose for a photo in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (L), and his wife Meghan, Duchess of Sussex, walk away after posing for photographs with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
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Harry and Meghan Markle welcomed Baby Archie in early May. The two have been settling into parenthood quite nicely, enjoying their time with their baby boy. While Meghan is on maternity leave, she did step out over the weekend to attend Trooping the Colour with the rest of the royal family.

As far as Meghan and sister-in-law Kate Middleton's relationship? "I hear that Kate has made herself available to Meghan if she needs advice, if she needs any help, and Kate said to her, I'm here. I'm here for you," Nicholl also tells ET about the Duchess' being there for each other. 

Meanwhile this weekend, Harry will be celebrating his first Father's Day. According to Nicholl, it will most likely be a "low key" day for the new parents.

"They celebrated Meghan's first Mother's Day quietly in the grounds of Frogmore," she explains. "She released that beautiful picture of Archie's little feet. It wouldn't surprise me at all if they celebrated with another picture on Instagram."

"This is going to be a really important day for Prince Harry. He waited for a very long time to become a father," she adds. "There were moments when he feared he would never become a dad. So to mark Father's Day with baby Archie is going to be really special, and if we're lucky, who knows, we may even get a glimpse of the new prince on Instagram."

40 PHOTOS
Royal family at Trooping the Colour
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Royal family at Trooping the Colour
LONDON, ENGLAND - JUNE 08: Prince Louis, Prince George, Prince William, Duke of Cambridge, Princess Charlotte and Catherine, Duchess of Cambridge appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Queen Elizabeth II and Prince Andrew, Duke of York appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex ride by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Louis, Prince George, Prince William, Duke of Cambridge, Princess Charlotte and Catherine, Duchess of Cambridge appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Louis, Prince George, Prince William, Duke of Cambridge, Princess Charlotte and Catherine, Duchess of Cambridge appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Louis, Prince George, Prince William, Duke of Cambridge, Princess Charlotte and Catherine, Duchess of Cambridge appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Charles, Prince of Wales, Queen Elizabeth II appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II and Prince Andrew, Duke of York appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince George of Cambridge and Princess Charlotte of Cambridge watch a flypast from the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. The annual ceremony involving over 1400 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marks the official birthday of the Sovereign, although the Queen's actual birthday is on April 21st. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - JUNE 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge watch a flypast from the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. The annual ceremony involving over 1400 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marks the official birthday of the Sovereign, although the Queen's actual birthday is on April 21st. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - JUNE 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex ride by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince George of Cambridge and Princess Charlotte of Cambridge watch a flypast from the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. The annual ceremony involving over 1400 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marks the official birthday of the Sovereign, although the Queen's actual birthday is on April 21st. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - 2019/06/08: Britain's Queen Elizabeth II is seen in a carriage on her way to Buckingham Palace after the Trooping the Colour ceremony, which marks her 93rd birthday. (Photo by Dinendra Haria/SOPA Images/LightRocket via Getty Images)
LONDON, UNITED KINGDOM - 2019/06/08: Catherine Duchess of Cambridge (R) and Meghan Duchess of Sussex (L) are seen in a carriage on their way to the Horse Guards Parade during the Trooping the Colour ceremony, which marks the 93rd birthday of Queen Elizabeth II, Britain's longest reigning monarch. (Photo by Dinendra Haria/SOPA Images/LightRocket via Getty Images)
LONDON, UNITED KINGDOM - JUNE 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge, Prince Louis of Cambridge and Camilla, Duchess of Cornwall on the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. The annual ceremony involving over 1400 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marks the official birthday of the Sovereign, although the Queen's actual birthday is on April 21st. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - 2019/06/08: Meghan Duchess of Sussex and Prince Harry are seen in a carriage on their way to Buckingham Palace after attending the Trooping the Colour ceremony, which marks the 93rd birthday of, Queen Elizabeth II, Britain's longest reigning monarch. (Photo by Dinendra Haria/SOPA Images/LightRocket via Getty Images)
LONDON, ENGLAND - JUNE 08: Catherine, Duchess of Cambridge rides by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Lady Louise Windsor rides by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Edward, Earl of Wessex rides by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II, Prince William, Duke of Cambridge and Prince Andrew, Duke of York seen on the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II, Prince William, Duke of Cambridge and Prince Andrew, Duke of York seen on the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Prince Edward, Earl of Wessex, Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge, Autumn Phillips, Peter Phillips, Savannah Phillips and Isla Phillips seen on the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Prince George, Princess Charlotte, Prince William, Duke of Cambridge, Prince Louis and Catherine, Duchess of Cambridge seen on the balcony of Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Princess Eugenie Windsor and Jack Brooksbank during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JUNE 08: Princess Beatrice Windsor and Jack Brooksbank during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JUNE 08: Meghan, Duchess of Sussex rides by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: (L-R) Lady Louise Windsor, Sophie, Countess of Wessex, James Viscount Severn and Prince Edward, Earl of Wessex during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JUNE 08: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince Louis of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JUNE 08: Princess Beatrice of York and Princess Eugenie of York leave Buckingham Palace in a carriage during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Meghan, Duchess of Sussex rides by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex ride by carriage down the Mall during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Charles and Camilla, Duchess of Cornwall arrive to Buckingham Palace during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex arrive to Buckingham Palace in a carriage during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, ENGLAND - JUNE 08: Meghan, Duchess of Sussex, Prince Harry, Duke of Sussex and Catherine, Duchess of Cambridge leave Buckingham Palace in a carriage during Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. (Photo by James Devaney/Getty Images)
LONDON, UNITED KINGDOM - JUNE 08: Autumn Phillips, Peter Phillips and their children Savannah Phillips and Isla Phillips stand on the balcony of Buckingham Palace following Trooping the Colour on June 08, 2019 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 08: Autumn Phillips, Peter Phillips and their children Savannah Phillips and Isla Phillips stand on the balcony of Buckingham Palace following Trooping the Colour on June 08, 2019 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 08: Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge ride in an open carriage as they attend Trooping the Colour on June 08, 2019 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Louis of Cambridge and Princess Charlotte of Cambridge wave from a window of Buckingham Palace as they attend Trooping The Colour, the Queen's annual birthday parade, on June 8, 2019 in London, England. The annual ceremony involving over 1400 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marks the official birthday of the Sovereign, although the Queen's actual birthday is on April 21st. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - JUNE 08: Lady Louise Windsor attends Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JUNE 08: Prince Charles, Prince of Wales, Queen Elizabeth II and Prince Andrew, Duke of York appear on the balcony during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Karwai Tang/WireImage)
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