Which were better than thyself More innocent, righteous, and godly. This seems to intimate that they were pious persons, who abhorred idolatry. And, if so, his sin was the more heinous in cutting them off, as proceeding from enmity to God, as well as to them.
Related Commentaries of 2 Chronicles 21:13
2 Chronicles 21:13
13 But hast walked in the way of the kings of Israel, and hast made Judah and the inhabitants of Jerusalem to go a whoring, like to the whoredoms of the house of Ahab, and also hast slain thy brethren of thy father's house, which were better than thyself: