It didn't, Mark Williams has played Arthur Weasley throughout the whole series.
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Alex Crockford played him in Harry Potter and the Prisoner of Azkaban. Charlie was cut from the rest of the movies.
Ron Weasley is the character, the actor who played him is Rupert Grint.
Harry Potter's oldest child is James potter because he was the first one of harry's children to go to hogwarts.
Yes, Julie Walters has played the role of Molly Weasley in all eight Harry Potter movies.
Rupert Grint is the name of the actor who played Ron Weasley in all eight Harry Potter movies.