What does 1 Chronicles 6:20 mean?

Korah's son was Izhar, Izhar's son was Kohath, Kohath's son was Levi, and Levi was the son of Israel. 1 Chronicles 6:20 - Modern Text Bible

(The genealogy reaches all the way back to Levi, the ancestor of the tribe, and then to Israel (Jacob), the father of the nation.)