'Son' in the Bible

The words of the Preacher, the son of David, king in Jerusalem:

There is one who is alone, and he has neither son nor brother. There is no end to all of his labor, neither are his eyes satisfied with wealth. "For whom then, do I labor, and deprive my soul of enjoyment?" This also is vanity. Yes, it is a miserable business.

Those riches perish by misfortune, and if he has fathered a son, there is nothing in his hand.

Happy are you, land, when your king is the son of nobles, and your princes eat in due season, for strength, and not for drunkenness!

Furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.