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The social media post was signed by George, 10, Charlotte, 9, and Louis, 6, who wrote, \"We love you, Papa. Happy Father’s Day 💕 G, C & L.\"

The three children joined their parents on June 15 at Trooping the Colour, marking the first official public appearance for the siblings since December.

\"PHOTO:
Chris Jackson/Getty Images
PHOTO: Prince George of Wales, Prince William, Prince of Wales, Prince Louis of Wales, Catherine, Princess of Wales and Princess Charlotte of Wales on the balcony during Trooping the Colour at Buckingham Palace on June 15, 2024 in London
>

The event was also the first time Kate was seen in public with other royal family members since December, and since announcing her cancer diagnosis in March.

The palace has not said what type of cancer Kate was diagnosed with.

In the first update on her health, Kate said on June 14 that she is \"making good progress\" as she undergoes chemotherapy but is not \"out of the woods yet.\"

\"I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days,\" Kate said in a written message shared by the palace. \"On those bad days you feel weak, tired and you have to give in to your body resting. But on the good days, when you feel stronger, you want to make the most of feeling well.\"

Kate said her treatment will continue \"for a few more months,\" adding, \"On the days I feel well enough, it is a joy to engage with school life, spend personal time on the things that give me energy and positivity, as well as starting to do a little work from home.\"

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