The Hebrew has the reading “mocking/laughing” in verse 9 of chapter 21. On the other hand, the Greek Septuagint (LXX) and the Latin Vulgate (VG) have added “her son Isaac” in verse 9 of chapter 21.
Genesis 21:8-10 — How Are We to Understand Ishmael’s Mocking of Isaac?
Genesis 21:8-10 reveals Ishmael's mocking of Isaac, portraying hostility, enforcing Sarah's demand for their exile to protect covenant integrity.

