TSK · Genesis 25:19

Abraham named his son– whom Sarah bore to him– Isaac.

Keturah’s Descendants The sons to whom Keturah, Abraham’s concubine, gave birth:Zimran, Jokshan, Medan, Midian, Ishbak, Shuah.The sons of Jokshan:Sheba and Dedan.

Abraham was the father of Isaac, Isaac the father of Jacob, Jacob the father of Judah and his brothers,

Then God gave Abraham the covenant of circumcision, and so he became the father of Isaac and circumcised him when he was eight days old, and Isaac became the father of Jacob, and Jacob of the twelve patriarchs.