Ron - Rupert Grint
Ginny - Bonnie Wright
Fred - James Phelps
George - Oliver Phelps
Molly (mom) - Julie Walters
Arthur (dad) - Mark Williams
Bill - Domhnall Gleeson
Percy - Chris Rankin
Charlie - Alex Crockford
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If you mean Mr. Filch, the creepy caretaker who has a cat named Mrs. Norris, then this is your answer: Argus Filch is played by David Bradley in the Harry Potter Films
PATERNAL GRANDFATHER -- According to Harry Potter Wiki, it is possible that James Potter I's father and Harry Potter's paternal grandfather is Charlus Potter, a pure-blood wizard who married Dorea Black from the Black family. If not, we may identify him as the default Mr. Potter. PATERNAL GRANDMOTHER -- According to Harry Potter Wiki, it is possible that James Potter I's mother and Harry Potter's paternal grandmother is Dorea Potter (née Black), a pure-blood witch from the Black family who married pure-blood wizard Charlus Potter. If not, we may identify her as the default Mrs. Potter. MATERNAL GRANDFATHER -- There is no canonical proof about the first name of Lily Evans's father and Harry Potter's maternal grandfather, so we may identify him as the default Mr. Evans. MATERNAL GRANDMOTHER -- There is no canonical proof about the first name of Lily Evans's mother and Harry Potter's maternal grandmother, so we may identify her as the default Mrs. Evans.
James and Oliver Phelps play Fred and George Weasley in the Harry Potter movies.
At some point he would have. He survived during the books.
Mr and Mrs Potter. Forenames have never been released. Some people believe they are called Charlus and Dorea however this seems unlikely because J.K. Rowling stated that his parents were older when they had him and these two do not fit the profile.