Their sisters were Zeruiah and Abigail. Zeruiah’s three sons: Abishai, Joab, and Asahel.

Amasa’s mother was Abigail, and his father was Jether the Ishmaelite.

These were David’s sons who were born to him in Hebron:
Amnon was the firstborn, by Ahinoam of Jezreel;
Daniel was born second, by Abigail of Carmel;