Genesis 28:9

Esau went unto Ishmael That is, the family of Ishmael, for Ishmael himself, no doubt, was dead before this time, (see Genesis 25:17,) and took Mahalath to be his wife. It is probable that he thought by this means to ingratiate himself with his father, and so to get another and a better blessing. But, alas! he mends one fault by committing another, and taking a third wife, when he had one too many before.