Dinotopia Season 1 Episode 1

Pilot Frank Scott takes his sons, half-brothers raised by different mothers, along on an island hopping holiday, but just after spotting an unchartered yet inhabited large isle, the plane crashes at sea and unconscious Frank presumably drowns. Dardevil Karl and cautious, studious David swim ashore and are astonished to be find a society where people cohabit happily with tame, even speaking dinosaurs.