"The child grew, and when Isaac no longer needed mother's milk, Abraham had a large feast." The phrases "the child" and "Isaac" both refer to to Abraham and Sarah's baby boy.
## the son of Hagar the Egyptian, whom she had borne to Abraham, mocking ##
The name of Hagar's son can be stated explicitly. "Ishmael, the son of Hagar the Egyptian and Abraham, laughing at Isaac." (See: [[rc://en/ta/man/translate/figs-explicit]])