A third son is born to Arthur and Molly Weasley, joining older brothers Bill and Charlie. He is named Percy Ignatius.
We know the day from Jo's website, and can determine the year based on the fact that Percy is four years above Harry at school.
Percy is born
Date August 22nd, 1976
Certainty Stated in canon
Location in Canon JKR (website)
Type of Event Wizarding world
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