1. It's pretty hard to say with a straight face a person whose family hasn't been in Palestine in nearly two thousand years is native and someone born there isn't. 2. Very few native Palestinians are descended from Arabs. Most of them are descended from native who converted.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)
from the article: Tibi: Lieberman is an immigrant who's racist against the native Arabs