Princess Eugenie and Edoardo Mapelli Mozzi rallied around Princess Beatrice over the weekend.
The elder Princess of York released a special article on Sunday, which coincided with her younger sister Eugenie's 35th birthday.
The article documented Beatrice's experiences with giving birth to a premature daughter in January, Athena Elizabeth Rose.
After the article was released, Princess Eugenie used her 35th birthday celebrations to highlight her older sister's moment in the spotlight.
Edoardo Mapelli Mozzi and Princess Eugenie rally around Princess Beatrice after heartbreaking admission
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She wrote on her Instagram story: "Proud of you Beabea and mighty Athena."
Borne, a medical research charity that helps end premature birth, made Beatrice, 36, a patron earlier this month.
Eugenie shared Borne Charity's statement about Princess Beatrice on her Instagram, adding: "And this is why Bea's article is so important. @bornecharity @mrsalice."
The younger Princess of York was not the only family member to praise Beatrice for her Vogue article.
Her husband, Edoardo Mapelli Mozzi, took to Instagram to lavish praise on his wife.
Edoardo wrote: "So much pride for my beautiful wife, who has bravely shared our story of Athena’s early arrival.
"Also for her support and patronage for the incredible organisation @bornecharity, which provided us with invaluable help during that challenging time."
On Saturday, Edoardo's eldest child, Wolfie, who he co-parents with his ex Dara Huang, had a party for his upcoming ninth birthday.
Princess Eugenie shared a sweet statement about her older sister Beatrice
Instagram / Princess Eugenie
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Wolfie made his royal debut in December 2022 at Sandringham for ChristmasPAHuang shared pictures and videos of the exciting occasion, although it is not clear if Edoardo attended.
The former couple split up in 2018, with Edoardo going on to marry Princess Beatrice in 2020.
Wolfie, who has attended several public Royal Family events with his father, will turn nine on March 28.
Princess Beatrice has embraced the role of stepmother, referring to Wolfie as her "bonus son".
