Read Genesis 28:9 Using Other Translations
Then went Esau unto Ishmael, and took unto the wives which he had Mahalath the daughter of Ishmael Abraham's son, the sister of Nebajoth, to be his wife.
Esau went to Ishmael and took as his wife, besides the wives he had, Mahalath the daughter of Ishmael, Abraham's son, the sister of Nebaioth.
So Esau visited his uncle Ishmael’s family and married one of Ishmael’s daughters, in addition to the wives he already had. His new wife’s name was Mahalath. She was the sister of Nebaioth and the daughter of Ishmael, Abraham’s son.