Fans notice 2 kids are missing from Prince William's Father's Day tribute

Noticeably absent. Prince William and Duchess Kate shared a sweet picture of the future king with Prince Louis, on Sunday, June 16 ⁠— but fans realized that their other two children did not get the same attention.

“Happy Father’s Day!” the couple captioned two photos on their official Instagram page on Sunday. The first snap featured William, 36, and his 13-month-old son.

The second photo, on the other hand, showed the Duke of Cambridge walking alongside his own father, Prince Charles, with a helicopter in the background. (William is a former RAF helicopter pilot.)

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Happy Father’s Day!

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Prince George, 5, Princess Charlotte, 4, and Kate’s own dad, Michael Middleton, were not part of the tribute — and the public took notice.

One confused Instagram user took to the comments section, writing, “Sorry, I don’t agree with the photo’s choice. Where are Charlotte and George? Where is Kate’s father?”

A second user chimed in, saying, “Apparently Kate doesn’t have a dad and William only has one child. Happy fathers day!”

And a third voiced the same concern: “Where’s Prince George and Princess Charlotte plus Catherine’s father?”

All five members of the Cambridge family did, however, make an appearance at the annual Trooping the Colour parade earlier this month. This marked the first time Louis appeared on the Buckingham Palace balcony for the event, which celebrates Queen Elizabeth II‘s birthday.

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The Cambridge Family at Trooping the Colour
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The Cambridge Family at Trooping the Colour
(L-R) Britain's Prince William, Duke of Cambridge holding Prince Louis, Prince George, Princess Charlotte, Britain's Catherine, Duchess of Cambridge, Britain's Camilla, Duchess of Cornwall, Britain's Prince Charles, Prince of Wales and Britain's Queen Elizabeth II stand with other members of the Royal Family on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - JUNE 08: Princess Charlotte, Catherine, Duchess of Cambridge and Prince Louis during Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
(L-R) Britain's Prince William, Duke of Cambridge holding Prince Louis, Prince George, Princess Charlotte, Britain's Catherine, Duchess of Cambridge, Britain's Camilla, Duchess of Cornwall, Britain's Prince Charles, Prince of Wales and Britain's Queen Elizabeth II stand with other members of the Royal Family on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
(L-R) Britain's Prince William, Duke of Cambridge, Prince George, Princess Charlotte and Britain's Catherine, Duchess of Cambridge holding Prince Louis stand with other members of the Royal Family on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
(L-R) Britain's Prince William, Duke of Cambridge, Prince George, Princess Charlotte and Britain's Catherine, Duchess of Cambridge holding Prince Louis stand with other members of the Royal Family on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
(L-R) Britain's Prince William, Duke of Cambridge holding Prince Louis, Prince George, Princess Charlotte and Britain's Catherine, Duchess of Cambridge stand with other members of the Royal Family on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge smiles as she returns to Buckingham Palace after the Queen's Birthday Parade, 'Trooping the Colour', in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - JUNE 08: Catherine, Duchess of Cambridge attends Trooping The Colour, the Queen's annual birthday parade, on June 08, 2019 in London, England. (Photo by Karwai Tang/WireImage)
Britain's Prince William, Duke of Cambridge on horseback follows Britain's Queen Elizabeth II in a horse-drawn carriage into Horseguards parade for the Queen's Birthday Parade, 'Trooping the Colour', in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
(L-R) Britain's Prince Charles, Prince of Wales, Britain's Prince William, Duke of Cambridge, Britain's Prince Andrew, Duke of York, and Britain's Princess Anne, Princess Royal on horseback follow Britain's Queen Elizabeth II in a horse-drawn carriage into Horseguards parade ahead of the Queen's Birthday Parade, 'Trooping the Colour', in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Tolga AKMEN / AFP) (Photo credit should read TOLGA AKMEN/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, (L) and Britain's Catherine, Duchess of Cambridge (R) are driven to Buckingham Palace ahead of the Queen's Birthday Parade, 'Trooping the Colour', in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, (L) and Britain's Catherine, Duchess of Cambridge (R) are driven to Buckingham Palace ahead of the Queen's Birthday Parade, 'Trooping the Colour', in London on June 8, 2019. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1400 parading soldiers, almost 300 horses and 400 musicians take part in the event. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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The little one donned a white button-down shirt with blue embroidery similar to his brother, while his sister sported a blue-and-white collared dress at the June 8 occasion. William wore his usual military uniform, while the 37-year-old duchess, whom he wed in April 2011, stunned in a pale yellow ensemble and a matching hat.

The youngest of the brood rang in his 1st birthday on April 23. His mother shared three never-before-seen photos one day prior to commemorate the celebration.

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