הָכִ֧ינוּ לְבָנָ֛יו מַטְבֵּ֖חַ בַּעֲוֺ֣ן אֲבוֹתָ֑ם בַּל־יָקֻ֙מוּ֙ וְיָ֣רְשׁוּ אָ֔רֶץ וּמָלְא֥וּ פְנֵֽי־תֵבֵ֖ל עָרִֽים׃
你們要為他的子孫預備殺戮之地，因他們父輩的罪孽，免得他們興起，佔據大地，使普天之下遍滿仇敵。
Rashi
Prepare a slaughter for his sons lest they rise and inherit the land, and the land will be filled with enemies and oppressors. So did Jonathan render עַָרִים, enemies. Comp. (I Sam. 28:16) “And has become your adversary (עָרֶךְ).” It can also be interpreted: And fill the surface of the earth with cities. In contrast with what he said before (verse 17): “Who made the land like a desert and demolished his cities,” he says further: His seed shall perish, and the inhabitants of the cities shall return to their place, and the surface of the earth shall be filled with cities.
Ibn Ezra
Their fathers. His father Evil Merodach and his grandfather Nebuchadnezzar.