The Duchess of Cambridge's great-great-grandfather, Francis Martineau Lupton's three sons - Francis, Maurice and Lionel - were all killed in action within two years of each other.
Kate Middleton made a surprise visit to London's Imperial War Museum ahead of the UK's Armistice Day, where she was shown letters written by members of her family who died in the First World War.
As millions of American step out with clever and unique looks for the holiday, Kate Middleton chose to keep things classy and handsome once again as she attended a special event.
The eldest, Major Francis, served with the 8th Battalion West Yorkshire Regiment and was killed by a bomb in 1917 aged 31. A letter from Maurice to his father on 24 May 1915 reads, "Lionel was here the day before yesterday for a bit, & I have seen him two or three times in the last few days".
Kate was shown an official letter from Buckingham Palace expressing King George V's sympathy after the third brother had died.
Before looking at the letters, Kate took a short tour of the First World War Galleries where she was shown elements of the galleries that relate to the experience of her relatives.
The revelation happened during a visit to Basildon Sporting Village in Essex alongside husband, Prince William on Tuesday.
As for their immediate family, the Duke and Duchess of Cambridge have often said they strive to give their children a "normal" upbringing which very likely includes an abundance of hugs.
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