How was Abraham considered the father of the irsalites?

Abraham is considered the father of the Israelites because he is regarded as the founding patriarch of the Hebrew people in the biblical narrative. According to the Book of Genesis, God made a covenant with Abraham, promising him numerous descendants who would become a great nation. His son Isaac and grandson Jacob (later named Israel) are key figures in this lineage, with Jacob's twelve sons becoming the ancestors of the twelve tribes of Israel. Thus, Abraham's role as the progenitor establishes him as the spiritual and ancestral father of the Israelites.