'Son' in the Bible

The words of Amos, who was among the herdsmen of Tekoa, which he saw concerning Israel in the days of Uzziah king of Judah, and in the days of Jeroboam the son of Joash king of Israel, two years before the earthquake.

Then answered Amos, and said to Amaziah, I was no prophet, neither was I a prophet's son; but I was a herdsman, and a dresser of sycomore-trees:

And I will turn your feasts into mourning, and all your songs into lamentation; and I will bring sackcloth upon all loins, and baldness upon every head; and I will make it as the mourning for an only son, and the end thereof as a bitter day.