Sons of Abraham: Isaac and Ishmael.
and God saith unto Abraham, `Let it not be wrong in thine eyes because of the youth, and because of thy handmaid: all that Sarah saith unto thee -- hearken to her voice, for in Isaac is a seed called to thee.
And these `are' births of Ishmael, Abraham's son, whom Hagar the Egyptian, Sarah's handmaid, hath borne to Abraham;
And these `are' births of Isaac, Abraham's son: Abraham hath begotten Isaac;
Abram -- he `is' Abraham.
These `are' their generations: first-born of Ishmael, Nebaioth, and Kedar, and Adheel, and Mibsam,
And Abraham begetteth Isaac. Sons of Isaac: Esau and Israel.