You see all the "Abrahamic" religions (Judaism, Christianity, and Islam) base the whole thing on this fellow Abram/Abraham.
Terah is father to Abram, Nahor and Haran.
Terah is also father to Sarai ( as discovered when Abram fessed up to Abimilek).
Abram marries his father's daughter, Sarai, who is now his sister and his wife.
Haran has a daughter, Milkah, and a son, Lot.
Nahor marries his brother Haran's daughter, Milkah, who gives birth to eight sons..
Abram has a son, Ishmael, with Hagar, Sarai's servant.
Lot has a son, Moab, by one of his daughters, and another son, Ben-Ammi, by another one of his daughters.
Abram disowns Hagar and Ishmael and sends them off into the desert where death awaits.
Abram has a son, Isaac, with Sarai.
Because of his close relationship with the Lord, Abram is now blessed and becomes the father of nations and the new owner of the Promised Land.