Shammah: David's Brother: Called Shimeah
Source: Nav
2 Samuel 13:3, 32
Now Amnon had a friend named Jonadab, the son of David’s brother Shimeah. Jonadab was a very shrewd man, / But Jonadab, the son of David’s brother Shimeah, spoke up: “My lord must not think they have killed all the sons of the king, for only Amnon is dead. In fact, Absalom has planned this since the day Amnon violated his sister Tamar.
2 Samuel 21:21
and when he taunted Israel, Jonathan the son of David’s brother Shimei killed him.