Naboth had sons who were also put to death at this time (marginal reference). It is not improbable that they were stoned together with their parent (compare Joshua 7:24-25). In the East, a parent’s guilt constantly involves the punishment of his children. Contrast 2 Kings 14:6.
Related Commentaries of 1 Kings 21:13
1 Kings 21:13
13 And there came in two men, children of Belial, and sat before him: and the men of Belial witnessed against him, even against Naboth, in the presence of the people, saying, Naboth did blaspheme God and the king. Then they carried him forth out of the city, and stoned him with stones, that he died.