13 little-known facts about Jacob Black that even die-hard 'Twilight' fans may have missed

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• Jacob Black is a major character in Stephenie Meyer's "Twilight" book and film series.
• He wasn't always going to be a large role, and werewolves originally weren't part of the story.
• He has two older sisters that are mentioned in the novels but not the movies.

Jacob Black has two older sisters in the books.

Jacob's older sisters, Rachel and Rebecca Black, are never mentioned in the films.

They're twins that are about a year older than Bella Swan.

Since Rachel is on scholarship at college and Rebecca is married and living in Hawaii, they're rarely a part of the books' plots either.

His mother died in a car crash.

Jacob's mother died before the start of the first "Twilight" book in a brutal way.

He reflects on her death in "Breaking Dawn," which finally gives readers more information about what happened.

Jacob mentions his mother died in a car accident that left her body so mangled she was buried in a closed-casket ceremony with her coffin nailed shut.

Jacob was meant to be a minor character.

In the first "Twilight" book, Jacob appears as a minor character that introduces Bella to the "cold ones" lore about the Cullen family.

But author Stephenie Meyer made the decision to expand Jacob's story when she realized how much she liked the character.

On her website, Meyer described the process of writing the werewolf as the "first experience with a character taking over," adding he developed "such roundness and life" that she "couldn't keep him locked inside a tiny role."

Jacob is more powerful than the other werewolves.

In "New Moon," Jacob tells Bella what it's been like for him to adjust to being a werewolf.

He mentions that he finds it easier to phase back and forth than the other wolves, which he believes is because of his ancestry.

Both of Jacob's great-grandfathers were werewolves, so he has supernatural blood on both sides of his family.

He has the body of a 25-year-old when he's 16.

When the werewolves in "Twilight" turn for the first time, they physically grow very quickly before halting the aging process altogether until they're significantly older.

Because of this, Jacob has the body of a 25-year-old when he's a high schooler.

The sudden growth spurt is also why he's so tall — it's revealed in "Eclipse" that Jacob stands at 6 feet and 7 inches.

Jacob is one of the only werewolves who dislikes his abilities.

Most of the werewolves in Sam's pack seem enthusiastic about their abilities, but in "Eclipse," Jacob tells Bella that he and Sam Uley are the only ones who dislike it.

Sam doesn't like how imprinting and accidentally losing control of his temper have impacted his relationships.

On the other hand, Jacob resents his powers because he never chose to become a werewolf and feels like he was roped into a supernatural war he previously didn't know existed.

He helped take care of his father from a young age.

Jacob's father, Billy Black, didn't use a wheelchair until some time after his wife died.

By the time Billy started needing one, Jacob's sisters were already older and spending less time at home.

So Jacob helped his dad care for their household, which he didn't seem to mind since they had a close relationship.

Even though he eventually leads his own pack, Jacob was supposed to be the original alpha of the main group.

In "Eclipse," Jacob tells Bella that since his great-grandfather, Ephraim Black, was the last chief of the Quileute tribe, Jacob was supposed to be the alpha of the werewolf pack.

Jacob deferred to Sam, but later became the alpha of his own pack.

When he breaks away from Sam's pack in "Breaking Dawn," Seth and Leah Clearwater follow Jacob and recognize him as their alpha.

Jacob wasn't always going to be a werewolf.

In Meyer's original idea of "Twilight" as a standalone novel, werewolves weren't going to be part of the story.

Even though the legends Jacob tells Bella mention them, the vampires were intended as the only relevant part of those stories.

On her website, Meyer wrote, "The dream Bella had of Jacob transforming into a wolf to protect her had no foreshadowing significance at the time. It was just my way of letting Bella's subconscious articulate the situation."

She added that the image "stuck with me" while writing "New Moon."