Caleb son of Hezron had children by his wife Azubah (and by Jerioth). These were her sons: Jesher, Shobab and Ardon.
References for 1 Chronicles 2:18
When Azubah died, Caleb1 married Ephrath, who bore him Hur.
References for 1 Chronicles 2:19
Hur was the father of Uri, and Uri the father of Bezalel.2
References for 1 Chronicles 2:20
Later, Hezron lay with the daughter of Makir the father of Gilead3 (he had married her when he was sixty years old), and she bore him Segub.
References for 1 Chronicles 2:21
Segub was the father of Jair, who controlled twenty-three towns in Gilead.
(But Geshur and Aram captured Havvoth Jair,4 as well as Kenath5 with its surrounding settlements--sixty towns.) All these were descendants of Makir the father of Gilead.
References for 1 Chronicles 2:23
After Hezron died in Caleb Ephrathah, Abijah the wife of Hezron bore him Ashhur6 the father of Tekoa.
References for 1 Chronicles 2:24
The sons of Jerahmeel the firstborn of Hezron: Ram his firstborn, Bunah, Oren, Ozem and Ahijah.
References for 1 Chronicles 2:25
Jerahmeel had another wife, whose name was Atarah; she was the mother of Onam.
The sons of Ram the firstborn of Jerahmeel: Maaz, Jamin and Eker.
The sons of Onam: Shammai and Jada. The sons of Shammai: Nadab and Abishur.