Genesis 36:3

3 also Basemath daughter of Ishmael and sister of Nebaioth.

Read Genesis 36:3 Using Other Translations

And Bashemath Ishmael's daughter, sister of Nebajoth.
and Basemath, Ishmael's daughter, the sister of Nebaioth.
He also married his cousin Basemath, who was the daughter of Ishmael and the sister of Nebaioth.