The crazy thing is that NONE of this genetic stuff matters.
The facts are:
The Palestinians are there and have been for a long time (regardless of what label you apply)
The Jews have been a sustained presence for a long time as well
At one time the Palestinians were a community that included Jews, Christians, Muslims, Druze and other religious minorities.
There has been extensive Arab immigration.
There has been extensive European immigration.
So what does that mean in relation to the situation today?
Nothing.
Nada.
You can't say one people has a greater right to be there than the other.
But only one people have accepted the multifaith aspects and stated they will accord each faith the same treatment. In fact it is a basic tenant of Zionism
As Herzl wrote in his book:
“Every man will be as free and undisturbed in his faith or his disbelief as he is in his nationality. And if it should occur that men of other creeds and different nationalities come to live amongst us, we should accord them honorable protection and equality before the law.”
- The Jewish State, Theodor Herzl, 1896