Kate read a letter of condolence sent on behalf of George V following the death of Major Francis A Lupton.
Catherine made an emotional and solo visit to London's Imperial War Museum on Wednesday to pay her respects to those who had fallen during the war, but also to her family.
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Prince William spent some time learning how to play foam javelin with a young sports group, while the duchess tried her hand at some youngsters' tennis.
Her family's letters, which form part of the museum's documents archive, have provided both an insightful yet poignant account of soldiers' time spent in the trenches. It was written on the day he was killed.
Kate said: "It's so bland, hardly any words".
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Francis Martineau Lupton, the Duchess's great-great-grandfather, had five children. He served with the 8 Battalion West Yorkshire Regiment and was 31-years-old.
The scheme was set up by The Royal Foundation following the London Olympics 2012 to inspire young people aged 16 to 24 with sport and create the next generation of sports coaches who will themselves go on to inspire their communities for many more generations to come.
He was the first of the brothers to be killed during the war in 1915.
Among the documents was also one of the official telegrams breaking the news that one of them had been killed.
The event was dedicated to the hundredth anniversary of armistice Day - the date that ended the hostilities of the First world war.
Fresh off of her maternity leave after welcoming her third child, Prince Louis, in April, the Duchess has been keeping a busy schedule.