2: Abraham's
second son was Isaac (Gen 21:3).
Isaac had a second son called Jacob (Gen 25:26).
Jacob who was later renamed to Israel had the 12
patriarchs, the
twelve Tribes of Israel. The Fourth son was called Judah (Which the
Jews of today are descendants of.)
Gen 21:3 And Abraham called the name of his son that was born
unto him, whom Sarah bare to him, Isaac.
Gen 25:26 And after that came his brother out, and his hand
took hold on Esau's heel; and his name was called Jacob: and Isaac was
threescore years old when she bare them.