Roslie was originally Roaslie Hale. She did not want to change her name. Jasper decided to take Rosalies name as he looked enough like her to pose as her brother so the family could be a foster family and still get away with Rosalie and Emmet being partners and Jasper and Alice being partners. If they were all Cullens this would be less acceptable.
In the Twilight series, Rosalie and Jasper have the same last name, Hale, because they were both turned into vampires by the same person, Carlisle Cullen. As a way to blend in, Carlisle often took in vampires with the last name "Cullen" to give the appearance of being a family.
Because they pretend they are twins.
The members of the Cullen "family" are trying to keep up the pretense that they are actually related. Edward, Alice, and Emmett took on the name Cullen when they were "adopted" by Carlisle and Esme; but it would be creepy for Alice and Jasper (and Rosalie and Emmett) to have the same last name, since they're together romantically. So Rosalie kept her original last name and they pretend that Jasper is her twin brother, hence his last name.
This is just a theory but maybe they have the same last nameI am nearing the end of the third book, and if Jasper and Rosalie have a closer relationship than adoptive brother and sister, it has not been explained yet. They have the same last name of Hale because they are posing as twins. Hale is Rosalie's real name from before she was turned in the 1930's. They could not be actual bother and sister, let alone twins, because in the third book Jasper is revealed to be much older than Rosalie. He was turned in the 1860's, and his real last name is Whitlock.
Jasper and Rosalie both have the last name Hale because they were both turned into vampires by the same person, Carlisle Cullen, and were then adopted into the Cullen family. The family chose to maintain the same last name for consistency and to help them blend in as a family unit.
Jasper's last name was originally Whitlock but he changed it when he joined the Cullens with Alice. Jasper uses whatever last name matches the current cover story being used by the Cullens. In Forks, he and Rosalie are pretending to be twins and foster children of the Cullens, so it makes sense that their last name would be the same and not Cullen.
the eldest is jasper. thenEdward then Rosalie then Emmet then Alice and Bella is the youngest. actually its Rosalie and Emmett ,then Alice Edward and Jasper Rosalie and Emmet are the same Age Edward and Jasper are the same age then Bella jasper and Emmett are both 20 then Rosalie is 19 then Alice and Bella are 18 (do they think of each other as twins) then the youngest is Edward Cullen?
In the Twilight series, some of the siblings have different last names because they were adopted into the same family. For example, Rosalie Hale and Jasper Hale were adopted by the Cullen family, hence having different last names.
Jasper Didn't Jasper and Alice join at the same time? Alice had a vision and went to look and wait for Jasper, when she did they both went to the Cullens.
Emmett's last name is Cullen. Jasper's last name is Hale. You never find out what Emmett's real last name is, so the Cullen's just decided to make it Cullen. They wanted to stay kind of hidden and conspicuous, so they had Jasper share a last name with Rosalie. Jasper's original last name is Whitlock. Rosalie and Jasper are both pale, tall and extraordinarily beautiful, so they could get away with being twins.
Before they were turned into vampires Emmett was born Emmett McCarty and Jasper was born Jasper Whitlock. They did not have the same last name.
The order is Jasper, Alice, Edward, Rosalie, Emmett. But because they go to school, the order is Emmett Jasper Rosalie Alice Edward. but over all, Jasper is the oldest in vampire years and human years but they are put this way to be in the same grade as their spouse. Me:(different answerer: HUH?
in human age, Esme is oldest then Carlisle, then Emmett then jasper, then Rosalie then Alice then Edward in vampire years, Carlisle is oldest, then Edward then Rosalie then Esme then Emmett then Jasper, then Alice ugh i just gave the same answer gees human = Esme, Carlisle, JASPER, Emmett, Rosalie, Alice, Edward. Vampire = Carlisle, Edward, Esme, Rosalie, Emmett, Alice, and JASPER.
in twilight, Emmett is 20, Alice is approximently 19, rosalie is 18, edward is 17 and Jasper is 16. at least that is how old they appear/ how old they were when they were changed. their actual ages as of 2005(when the story technically begins)are jasper- 162, Emmett- 90, Alice- approximently 104, rosalie- 90, and edward- 104.