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23rd April 2015
10:34am BST
The original video was filmed by the boys' dad who captured Harry's hilarious reaction when his one-year-old brother bit him. He only ever shared it on YouTube because the file was too big to send to family and friends via email.
In this video, Newsround's Ricky Boleto went to visit the boys to find out how the viral video has changed their lives.
https://www.youtube.com/watch?v=mU8RDfWJQ-AExplore more on these topics:
