I don't know why you keep calling the Palestinians, Arabs?
Are they descendants of Saudi tribes? When did that happen? I can't find any literature that shows any Saudi empire beyond the Saudi peninsula.
Palestinians may be Turks, or Christian Byzantines that converted to Islam. Or even descendants Jews who resided in the Levant in the time of the Romans. Genetic testing shows that Palestinians and pre-Israel Jews share genetic traits.
So lets stop the misinformation shall we.