Thank you! From what I've read the Palestinians are nominally at least descended from the Philistines of biblical history.

The Philistines were an Indo European people originally from Crete.

(of course there is much mixing after such a time, so "Arab" might not be completely off base).

They didn't just mix with Arabs. Many Palestinians are descendants from the 12 tribes of Israel but have been disowned be the rest of those tribes because their ancestors changed religions.