Seth and Leah turned into werewolves shortly before Harry Clearwater died. Finding out the they were both werewolves, Seth being 14 and Leah a girl, was what caused him to have a heart attack. above and there is proof in Eclipse
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Jacob is a werewolf. Technically, he does not become a werewolf until the second novel, New Moon, and he remains a werewolf for the rest of the series.
As far as I know, whenever he takes Wolfsbane Potion, he doesn't turn into a wolf. Actually, Remus turns into a wolf even when he takes the Wolfbane Potion. The difference is that when he does he retains his human mind rather than turning into a crazy monster. So yes, he turns into a werewolf every full moon.
Jacob in twilight isn't actually a werewolf he is a shape shifter as he doesn't posses all of the features of a werewolf because a werewolf bites people to turn them into werewolfs (their real name is children of the moon).Whereas Jacob was born into what he is but his family have stuck to just changing into werewolfes.
Remus LupinRemus Lupin is the famous werewolf character in Harry Potter. He is the Defense against the Dark Arts teacher in "Harry Potter and the Prisoner of Azkaban".He has no control over whether or not he turns into a werewolf. When there is a full moon, he turns.He is not an Animagus. They are people who have the magical ability to turn to animal form at will. His good friends chose to learn to be Animagi as a form of moral support for him.
It's because the Cullens are living in Forks. He wouldn't have turned into a vampire if there weren't vampires living nearby. He isn't a werewolf in Twilight because he isn't old enough yet, but he is in New Moon.