After Midnight (The Youngbloods #1) by Lynn Viehl

A Suspenseful New Series Featuring Vampires and Forbidden Love
Sophomore Catlyn Youngblood is used to the nomadic existence she and her two older brothers have shared since the death of their parents. When they settle down for good in the sleepy backwoods town of Lost Lake, Florida, Cat thinks they might finally fit in. Instead, they're shunned by the locals.
While riding her horse late one night, Cat meets an enigmatic and handsome boy named Jesse Raven. Even more strange than her overpowering attraction to him is Jesse's apparent aversion to the sun. As their attraction intensifies, long-kept secrets come to light. Cat learns that the Ravens are a centuries-old vampire clan . . . and worse still, that she and her brothers are descendents of Abraham Van Helsing, the world-famous vampire hunter. Mortal enemies by blood, the two families do all they can to keep them apart. But Cat and Jesse will risk everything to be together—including death.

Tranlation for my romanian readers:

O noua serie plina de suspans si de iubire interzisa.
Catlyn Youngblood, eleva in clasa a 10-a, este obisnuita cu existenta nomada pe care o duce impreuna cu fratii ei mai mari de cand au murit parintii lor. Cand se stabilesc in izolatul Lost Lake, Florida, Cat crede ca si-au gasit in sfarsit locul potrivit. In schimb sunt ocoliti de localnici.
In timp cese plimba calare intr-o noapte tarziu, Cat cunoaste un baiat, enigmatic si atragator, pe numa Jesse Raven. Mai ciudat decat aceasta coplesitoare atractie pentru el, este aparenta aversiune pentru soare a lui Jesse. Pe masura ce atractia dintre ei se intensifica, secrete de mult ascunse ies la suprafata. Cat afla ca familia Raven este un clan de vampiri vechi de sute de ani...si inca si mai rau, ca ea si fratii ei sunt descendenti ai lui Abraham Van Helsing, vanatorul de vampiri cunoscut in toata lumea. Inamici de moarte prin legaturile de sange, cele doua familii fac tot posibilul sa-i tina despartiti. Dar Cat si Jesse vor risca totul pentru a fi impreuna - chiar si viata.