What does 1 Chronicles 6:48 mean?

Shemer was the son of Mahli, who was the son of Mushi, who was the son of Merari, who was the son of Levi. 1 Chronicles 6:48 - Modern Text Bible

(Ethan's line is traced all the way back to Levi through Merari, another branch of the tribe. This shows the diversity within the Levite tribe.)