Either Matred was the father, and Mezahab the mother; or Matred was the mother, and Mezahab the grandmother.
Related Commentaries of Genesis 36:39
Genesis 36:39
39 And Baalhanan the son of Achbor died, and Hadar reigned in his stead: and the name of his city was Pau; and his wife's name was Mehetabel, the daughter of Matred, the daughter of Mezahab.