2 Samuel 13:1 - Clarke's commentary and critical notes on the Bible

And it came to pass after this, that Absalom the son of David had a fair sister, whose name was Tamar; and Amnon the son of David loved her. Whose name was Tamar - Tamar was the daughter of David and Maacah, daughter of the king of Geshur, and the uterine sister of Absalom. Amnon was David's eldest son by Ahinoam. She was therefore sister to Amnon only by the father's side, i.e., half-sister; but whole sister to Absalom.