“But Amnon had a friend, whose name was Jonadab, the son of Shimeah David's brother: and Jonadab was a very subtil man.”
King James Version (KJV)
13:1 A sister - His sister by father and mother.
13:2 A virgin - And therefore diligently kept, so he could not get private converse with her.
13:5 My sister - So he calls her, to prevent the suspicion of any dishonest design upon so near a relation. At her hand - Pretending, his stomach was so nice, that he could eat nothing but what he saw dressed, and that by a person whom he much esteemed.