The answer is: Grandson

Gen 21:3 / Gen 27:22 - Jacob was the son of Isaac, the same Isaac who was promised as a child to Abraham.

Jacob's connection to Abraham is a fascinating one, representing a pivotal part of biblical history that showcases the unfolding of God's promises. Abraham, regarded as the father of many nations, received a powerful promise that his descendants would be more numerous than the stars (Genesis 15:5). As a key player in this divine narrative, Jacob, who is also known as Israel, carried that promise forward as Isaac's son.

One fun trivia nugget is that the name Jacob means "grabber" or "supplanter," reflecting the cunning ways he initially achieved the birthright and blessing from his brother Esau. You might think of Jacob as a transformational figure, as he was also the namesake of the twelve tribes of Israel, each tribe crucial in the formation of the nation that would emerge generations later.

The dynamic between these generations can tell us much about familial legacies and the themes of struggle and triumph that are prevalent in the scriptures. Jacob's encounters with God, such as the dream of the ladder reaching to heaven (Genesis 28:12), reveal fluid communication between the divine and humanity, reminding us that there’s often more to the fabric of relationships in the Bible than initially meets the eye. So, while kinship wise, Jacob may be merely the grandson of Abraham, spiritually, he is a torchbearer of an incredible legacy!