Genesis 28:9

Then went Esau unto Ishmael,.... Not to Ishmael in person, for he was now dead, Ge 25:17, and had been dead as is reckoned about fourteen years before this, but to the house of Ishmael:and took unto the wives which he had; the daughters of Heth, and who seem by this to be both alive at this time:Mahalath the daughter of Ishmael, Abraham's son; the same with Bashemath, Ge 36:3; as the Targum of Jonathan expresses it, this person having two names, and is further described,the sister of Nebajoth, to be his wife; who was the eldest son of Ishmael, and, his father being dead, was the principal in the family; and this woman Esau took to wife was his sister by his mother's side, as the above Targum expresses, as well as by his father's; whereas he might have other sisters only by his father's side, he having had more wives than one.