As of this date, the earliest evidence of human life has been found in Africa. Fossilized bones were found there in recent years that were dated as being 150,000 years old. One hundred and fifty thousand years is approximately how long human beings in their present form have existed on this planet. Any human being can trace their ancestry back to Africa. In essence, all human beings alive today come from Africa.
All human beings are basically cousins.
Human beings took different paths as they gradually left Africa and spread to different parts of the world. Humans spread to parts of Asia and Europe. They moved from Asia into North America. They began to inhabit South America and Australia. The populations that settled in the different parts of the world became mostly disconnected from each other.