'Son' in the Bible

He answered and said, Lo, I see four men loose, walking in the midst of the fire, and they have no hurt; and the appearance of the fourth is like a son of God.

And thou, Belshazzar, his son, hast not humbled thy heart, although thou knewest all this;

I saw in the night visions, and behold, there came with the clouds of heaven one like a son of man, and he came up even to the Ancient of days, and they brought him near before him.

And he came near where I stood; and when he came, I was afraid, and fell on my face; and he said unto me, Understand, son of man; for the vision is for the time of the end.

In the first year of Darius the son of Ahasuerus, of the seed of the Medes, who was made king over the realm of the Chaldeans,