Eternal Life by Dara Horn

This is a sweeping look at eternity and the love that binds parents and their child. We make deals with God all the time - in times of despair or just when we need a bit of good luck but would you make a deal to live forever in exchange for God sparing the life of your son. That is exactly what Rachel and the boy's father did in biblical times. Rachel has watched her hundreds of children grow old, outlived all of her husbands only to die and be reborn as someone new. Her true love also made the pact and they continue to meet up but never stay together for long. When one of Rachel's grandchildren tries to study the secret of her longevity and asks for a DNA sample for a study her world spins out of control. The blend of old Hebrew teachings made modern and the flashbacks back to Rachel's first life is magical.