Genesis 28:9
and [to appease his parents] Esau went to [the family of] Ishmael and took as his wife, in addition to the wives he [already] had, Mahalath the daughter of Ishmael, Abraham’s son, the sister of Nebaioth [Ishmael’s firstborn son].
Genesis 36:3
and Basemath, Ishmael’s daughter, sister of Nebaioth.
Genesis 25:13-17
and these are the names of the [twelve] sons of Ishmael, named in the order of their births: Nebaioth, the firstborn of Ishmael, and Kedar, Adbeel, Mibsam,
Genesis 26:34
When Esau was forty years old he married Judith the daughter of Beeri the Hittite, and Basemath the daughter of Elon the Hittite as his wives;
Genesis 36:13
These are the sons of Reuel: Nahath, Zerah, Shammah, and Mizzah. These are the sons of Basemath, Esau’s wife.
Genesis 36:18
These are the sons of Oholibamah, Esau’s wife: Chiefs Jeush, Jalam, and Korah. These are the chiefs born of Oholibamah, daughter of Anah, Esau’s wife.