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Prince George had a major royal first at a Buckingham Palace event for veterans in May

Kate Middleton and Prince William's eldest son, who is second in line to the throne, turned 12 in July

A palace insider tells PEOPLE that William and Kate are preparing their son for the throne in a "slow game"

Prince George undertook his first royal duty by attending a Buckingham Palace tea honoring World War II veterans this spring, where he gave a glimpse of the leader he’s becoming.

George, 12, stepped into the spotlight like never before when he joined his parents, Prince William and Kate Middleton , at a May 5 palace event hosted by King Charles .

Dressed in a dark suit and blue tie, Prince George asked former service members thoughtful questions —“Did you see any U-boat

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