Yes
Alec and Jane. alec can take all of your senses away from you and Jane she can burn you mentally where you stand.
Jane and Alec don't go to school as the Cullens do. Although it is mentioned that they were both very young when they were changed, around 12 or so, so even think 13-14.
Jane can mentally hurt somebody and alec can block all feelonds from their body
Her twin brother is Alec, and no they are not cousins with the Cullens. They're just compatible by being vampires.
Yes. Alec changed before Jane because he was elder to her and Jane was too young to be changed into a vampire before Alec.
Aro Marcus Caius Jane Alec
Jane and Alec's ages are not mentioned in the book or the movie.
Yes, I am pretty sure.
Alec doesn't truly have a mate. All he has is his sister, Jane.
The names are unknown. But there is her mother,her father, and Jane and Alec which are Twins
Jane and Alec appear for a short amount of time in Breaking Dawn Part I.
Alec is Jane's twin. He is played by Cameron Bright