Dear Little Sister

Jasper Gilbert is the oldest of the Gilbert children at 22 and is 5 years older than Elena and 6 years older than Jeremy. Jasper is the son of Miranda Gilbert and Phoenix Everett. He is Elena and Jeremy's half brother. He is also a warlock. Tracking down his father while he was away for college he learned of his magic and his father taught him everything he knew and gave him his Grimoires. When the vampires arrive in town he isn't surprised and threatens Stefan that if he hurt his little sister than he would kill him and he gets along pretty well with Damon.
(Klaus Love Story)