2 Samuel 20:12-13

Amasa : son of David's sister Abigail and Jether the Ishmaelite,prince of Ephraim under Ahaz

Seba : son of Raamah son of Cush son of Ham son of Noah,son of Joktan of Shem,son of Jokshan son of Abraham and Keturah,a town that belonged to the tribe of Simeon,son of Bichri (Benjamin) who led a revolt against David,a country in southern Arabia whose queen visited Solomon (OS),son of Abihail; a founding father of one of the clans of Gad
(9° 1´, 38° 44´)

Syeba : name of a well
(9° 1´, 38° 44´)

Yoab : son of Asaph; record keeper of King Hezekiah,son of Zimmah one of the Levites of Gershon whom, along with his son Eden, King Hezekiah assigned to supervise the cleansing of the temple,son of Obed-Edom; a Levite gatekeeper whose descendants returned from exile,son of Joahaz; record keeper of King Josiah