These were all the sons of David,.... By his wives:
beside the sons of the concubines; who are not reckoned, and how many they were is not known; he had ten concubines at least, 2 Samuel 15:16 and
And Tamar their sister; not the sister of the sons of the concubines, but of his other sons, and only of Absalom by the mother's side, of whom see 2 Samuel 13:1.