passed to Abraham as a property for a burial place from the sons of Heth

"became Abraham's property for a burial ground when he bought it from the sons of Heth"

the sons of Heth

Here "sons" stands for those who descended from Heth. See how you translated this in Genesis 23:3. AT: "the descendants of Heth" (See: rc://en/ta/man/translate/translate-names)