'Sister's' in the Bible

When he saw the ring and the bracelets on his sister’s arms, and when he heard Rebekah his sister, saying, “The man said this to me,” he went to Eliezer and found him standing by the camels at the spring.

When Laban heard of the arrival of Jacob, his sister’s son, he ran to meet him, and embraced and kissed him and brought him to his house. Then he told Laban all these things.

Thus says the Lord God,‘You will drink your sister’s cup,Which is deep and wide [and filled to the brim].You shall be laughed at and derided;It contains much [too much to endure].