Nana82 I agree with Eileen, if you go back to Genesis you will see that Ishmael was born 15 years earlier than Isaac and was treated like the heir until Isaac's birth. Abraham doted on him, he was essentially a spoilt brat. He tried to kill Isaac several times til Sarah had enough and told Abraham to send Ishmael and his mother away. Ismael is the forefather of the
Arabs etc and Isaac the forefather of the Jews. Back in that day, a barren woman was rejected and mocked as someone who was out of God's favor; the only way she could prove herself to the mockers was to have a child by her husband via a surrogate mother, Hagar.