He said to him, “O son of the king, why are you so depressed morning after morning? Will you not tell me?”
And Amnon said to him, “I love Tamar, my brother Absalom’s sister.”
“Tamar, my brother Absalom’s sister.” Amnon was Tamar’s half-brother. But Absalom, David’s third son (2 Sam. 3:3), was Tamar’s full sister. Nevertheless, Amnon is called Tamar’s brother in 2 Samuel 13:10 because he was her half-brother.