[Florida native]

Before the birth of Sarah's son, Isaac, Abraham had married Hagar, who conceived and gave birth to Ishmael.

Abraham NEVER married Hagar. Sarah did not believe the promise of God and decided to take matters into her own hands. Sarah convinced Abraham to go to Hagar and have a child by her. Hagar was a concubine, not a wife.

[Askel5]

Okay ... but, if Ishmael was Abraham's son, he and Isaac still are brothers, right?