Midian
Siblings: Zimran, Jokshan, Medan, Ishbak, and Shuah. Half-siblings: Ishmael and Isaac.
Children: Ephah, Epher, Hanoch, Abidah, and Eldaah.
Other: Both by inference, and the reference in the margin to Exodus 2:15-16, one may conclude that the region of Midian where Moses lived took its name from this son of Abraham.