'Son' in the Bible

The words of Amos, who was among the sheepherders of Tekoa, which he saw [in a divine revelation] 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 Amos replied to Amaziah, “I am not a prophet [by profession], nor am I a prophet’s son; I am a herdsman and a grower of sycamore figs.

“And I shall turn your festivals and feasts into mourningAnd all your songs into dirges (funeral poems to be sung);And I shall cause sackcloth to be put on everyone’s loinsAnd baldness on every head [shaved for mourning].And I shall make that time like a time of mourning for an only son [who has died],And the end of it shall be like a bitter day.