When Lily and James Potter decided to go into hiding using the Fidelius Charm, they were going to use Sirius, James' best friend, as the Secret Keeper, but at the last moment changed to Peter Pettigrew after Sirius suggested that Voldemort would never guess that Peter was the Secret Keeper. Peter, who was secretly a Death Eater, then betrayed the Potters. So the Potters' Secret Keeper was Peter Pettigrew.
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That depends on which house you're talking about. Bill is Secret Keeper for Shell Cottage. Dumbledore is secret keeper for 12 Grimmauld Place.
The Dursley family. Mrs Dursley was the sister of Harry Potter's mother.
She has cancer
No. Cedric Diggory's family was quite average.
This weekend (Dec. 4th and 5th) on ABC Family