And Absalom made Amasa captain of the host instead of Joab: which Amasa was a man's son, whose name was Ithra an Israelite, that went in to Abigail the daughter of Nahash, sister to Zeruiah Joab's mother. Amasa captain of the host - From the account in this verse, it appears that Joab and Amasa were sisters' children, and both nephews to David.
Related Commentaries of 2 Samuel 17:25
2 Samuel 17:25
25 And Absalom made Amasa captain of the host instead of Joab: which Amasa was a man's son, whose name was Ithra an Israelite, that went in to Abigail the daughter of Nahash, sister to Zeruiah Joab's mother.