And his sons Isaac and Ishmael buried him in the cave of Machpelah, in the field of Ephron the son of Zohar the Hittite, which is before Mamre; The field which Abraham purchased of the sons of Heth: there was Abraham buried, and Sarah his wife.
See how the grave is calculated to reconcile differences! The mingling of the dust of relations, is an ancient custom. See Genesis 23:19.