Rachel is coming with the flocks, and when Yaakov saw her, he rolled the stone from above the well and watered the sheep of Lavan. Three times in one verse  it is mentioned that she is the daughter of Lavan, brother of his mother. What accounts for this repetition? Why is there a need to say that it Lavan is the brother of his mother?

This story parallels the story of Rivka and the servant of Avraham, with the watering of flocks. But Yaakov  -perhaps deliberately -takes the place of Rivka in an act of hessed to Rachel. It is the same but opposite model of theforefather meeting the foremother.