“The sons of Hezron, who were born to him, were Jerahmeel, Ram, and Chelubai.”
We are back at Hezron, one of the two sons of Perez, who was the son of Judah by Tamar. Apparently Hezron had 3 sons, Jerahmeel, Ram, and Chelubai. Interesting enough, this is the only mention of these 3 sons in the biblical literature. (1) Jerahmeel was the founder of the family of Jerahmeelites. However, Jerahmeel will also have a son called (2) Ram, the same name as his brother. This is the only mention in biblical literature of (3) Chelubai. However, the following sections seem to indicate that this is another name for Caleb.