Who Was Leah's Sister? Rachel in Genesis 29
Leah's sister is Rachel, named with her in the same verse. Genesis 29:16–17 sets the two sisters side by side and then contrasts them, which shapes everything that follows in Jacob's story.
Jacob's Wives: Leah and Rachel in Genesis 29
Jacob married two women, Leah and Rachel, both daughters of Laban. The passage tells how he came to have two wives, and it does not dress the arrangement up as anything but a household built on deception and favoritism.