'Son' in the Bible

The words of the Teacher, the son of David, king in Jerusalem.

Sometimes a man is all alone with no companion; he also has neither son nor brother. Yet there is no end to all his toil, and his eye is not satisfied with wealth. [He laments,] "For whom am I toiling and depriving {myself} of pleasure?" This also [is] vanity--it is an unhappy business!

Blessed are you, O land, when your king is a son of nobility and your princes feast at the proper time-- to gain strength and not to get drunk.

My son, be careful {about anything beyond these things}. For the writing of books is endless, and too much study {is wearisome}.