'Son' in the Bible

The words of Amos, who was among the herdsmen of Tekoa; what he saw about 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 earth-shock.

Your feasts will be turned into sorrow and all your melody into songs of grief; everyone will be clothed with haircloth, and the hair of every head will be cut; I will make the weeping like that for an only son, and the end of it like a bitter day.