'Besides' in the Bible

Besides, she actually is my sister, the daughter of my father, but not the daughter of my mother, and she became my wife;

Now there was a famine in the land, besides the previous famine that had occurred in the days of Abraham. So Isaac went to Gerar, to Abimelech king of the Philistines.

and Esau went to Ishmael, and married, besides the wives that he had, Mahalath the daughter of Ishmael, Abraham’s son, the sister of Nebaioth.

If you mistreat my daughters, or if you take wives besides my daughters, although no man is with us, see, God is witness between you and me.”