24-28. The three main branches in summary: Shem, Arphaxad, Shelah, Eber, Peleg, Reu, Serug, Nahor, Terah, and Abram (Abraham). And Abraham had Isaac and Ishmael.
29-31. Abraham’s family tree developed along these lines: Ishmael had Nebaioth (his firstborn), then Kedar, Adbeel, Mibsam, Mishma, Dumah, Massa, Hadad, Tema, Jetur, Naphish, and Kedemah—the Ishmael branch.
32-33. Keturah, Abraham’s concubine, gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. Then Jokshan had Sheba and Dedan. And Midian had Ephah, Epher, Hanoch, Abida, and Eldaah. These made up the Keturah branch.