The odds are that a DNA test would prove that the Palestinians have more Hebrew DNA than most Russian Jews.
People were conquered and reconquered for centuries in Palisrael. Anyone whose roots are there, regardless of religion, would likely have Caanaite, Philistine, Hebrew, Ehyptian, Hittite, Persian, Babylonian, Greek, Roman, Arab and Turkish blood.
Awarding land based on DNA would be impossible.