However, it was actions by the Arab leadership that caused the Palestinians to leave their homes.

This is not true. The Palestinians were driven from their homes through a process of ethnic cleansing by Jewish terrorists and paramilitaries that included outright massacres and terrorism. Hundreds of thousands had already been killed or driven from their homes in the several month period before Israel had declared its independence.

How many Jews are there in Jordan, the ARAB palestinian homeland???

There are Jews in Jordan. I don't know how many, but they are there. Using the word "Arab" in the way you do is profoundly racist. The way you use it would be like someone saying that if a Jew in Ireland is given a house, that would mean that the house of a Jew in Alaska should be taken away.