Modern Palestinians have no rational basis to assert that they are descendants of Canaanites more than Jews are. "Most modern Jewish groups and the Arabic-speaking groups from the region show at least half of their ancestry as Canaanite." https://www.biblicalarchaeology.org/daily/ancient-cultures/ancient-near-eastern-world/jews-and-arabs-descended-from-canaanites/ - No one speaks the Canaanite language anymore, and no one practices the Canaanite religion. Modern Jews and Palestinians are equally distance from their Canaanite ancestors. Therefore, both Jews and Palestinians are equally descendants of Canaanites.