'Sister's' in the Bible

As soon as he had seen the ring and the bracelets on his sister’s wrists, and when he had heard his sister Rebekah’s words—“The man said this to me!”—he went to the man. He was standing there by the camels at the spring.

When Laban heard the news about his sister’s son Jacob, he ran to meet him, hugged him, and kissed him. Then he took him to his house, and Jacob told him all that had happened.

You are not to marry a woman as a rival to her sister and have sexual intercourse with her during her sister’s lifetime.

This is what the Lord God says:You will drink your sister’s cup,which is deep and wide.You will be an object of ridicule and scorn,for it holds so much.