Genesis 28:9

Then went Esau unto Ishmael. In the blessing of Jacob by Isaac and Jacob’s commission to take a wife from among their relatives in Mesopotamia, Esau perceived the deep-rooted displeasure his parents felt toward his Hittite wives. No doubt with the intention of pleasing his parents, he went to fetch a wife from the family of his grandfather Abraham, as Jacob was instructed to do from the family of his maternal uncle, Laban. Mahalath, or Bashemath (ch. 36:3), whom he took to wife, was related to Isaac as Jacob’s wife Rachel was to his mother Rebekah. Esau married his father’s niece; Jacob, his mother’s. Esau’s going “unto Ishmael” must mean going “to the family of Ishmael,” for Ishmael died about 14 years prior to this time (see on chs. 25:19; 27:1).