Kate Middleton on Sunday shared a heartfelt photograph she took of Prince William with kids Prince George, Princess Charlotte and Prince Louis to celebrate Father’s Day as she continues to battle cancer.

“We love you, Papa. Happy Father’s Day G, C & L,” read the Princess of Wales’s caption on the couple’s official social media accounts.

The post comes one day after Middleton made her first public appearance in months after revealing she’s been battling cancer.

She stood between her husband and King Charles III, who announced his own fight against cancer in February.

The two were pictured on the balcony at Buckingham Palace with others in the Royal Family waving at the crowd of onlookers during the annual Trooping the Colour on Saturday.