'Grandsons' in the Bible

Ahab had seventy sons [and grandsons] in Samaria. So Jehu wrote letters and sent them to Samaria, to the rulers of Jezreel, to the elders, and to the guardians of the children of Ahab, saying,

These nations are worshiping the Lord and at the same time serving their idols; their sons and grandsons do just as their fathers have done, to this very day.