He is the son of Shimei.
1 Chronicles 23:7The sons of Gershon were Ladan and Shimei.1 Chronicles 23:8The sons of Ladan: Jehiel the chief, and Zetham, and Joel, three.1 Chronicles 23:9The sons of Shimei: Shelomith, and Haziel, and Haran, three. These were the heads of the fathers of Ladan.