It doesn't matter who they are "descendents of". As long as they haven't committed a crime - then just like anyone else they have a right to live where their families have lived for generations.
No they don't.
Descendants of murderous squatters have to right to that which belongs to others. They declared war. They lost. By what right do squatters who initiated a war have the right to that which they never owned in the first place?
They aren't squatters.
LINK showing that they own the land, either through international treaty or land deeds. A clue the Ottoman census put the numbers of arab muslims in Palestine to be very low, with the Christians outnumbering them in many places. The Jews owned most of Jerusalem, Hebron and other towns and cities.
Till the end of WWII most of the "local" arabs were serfs and most of those who "owned" land were foreign officials who had been given land by the Ottomans. The area was very poor and under/un-developed and little if any taxes were generated. Were were all these people who could afford to own land?
A tax province or sanjuk is not a state and the people within are not a nation. Sanjuks were little more than counties and what became the mandate were made up of at least half a dozen of these. Where was "palestine"? Even under the Romans there were three palæstina (name given by the romans) and mostly in what is now the gaza, sinai and jordan, not jerusalem or most of the roman towns in the fertile area.
The region was populated by people from throughout the mediterranean and middle east. To say there was a native people beside the jews is a misunderstanding. Yes, there are remnants of crusaders, armenians, persians, greeks, italians, french, english, etc. that has live there for hundreds of years but they were not a single people that were arab or palestinian. There were dozens of people and tribles like an amish quilt that existed as muslims or kafir in the area.
So where was this palestine? It was a region like saying the levant or fertile crescent.
So were was the state of palestine and who were the palestinian people, especially those who owned land?
Slaves, serfs, workers, share croppers, seasonal laborers, renters did not own the land or homes they occupied. Apart from some store owners in the urban areas, few locals owned land, even if their family have worked the land for generations.
Most did not want to serve in the military so the Ottoman gave land to those that served the government as officers, those from outside of those sanjuks. There was a tradition, before the Ottomans opened the area to jewish immigration, of land owned by jews/synagogues remained in those hands. It was passed down, sold to other jews or given to the synagogues to be rented or sold to other jews coming to the area. It never left jewish hands. Till the early 19th C jews could not buy non-jewish land, it could only be given by the empire or rented to them. Even being able to pray at the wall is a relatively modern privilage of the Ottomans, through there have been a few times off and on when it was permitted. The other land owners were the churches and wakf. The churches owned land they farmed to support themselves and the maintenance of the churches they were responsible for. The rest was for the most part state land.
The idea of a palestine or palestinian people is a modern creation, not historically based.
The muslims were arab, syrian, (later) jordanian, egyptian but not palestinian. They were known by tribe or were serfs in large part.
So where is the origin of this nation for the palestinians? Where are the lines for borders? Where is this history and government?
Why are they more deserving of a state than the kurds, yazidi, armeneans, zoroastrians or dozens of other "people" with their own language, traditions, religions, culture, history, etc.?