'Daughters in law' in the Bible

Then she arose with her daughters-in-law that she might return from the country of Moab, for she had heard in the country of Moab how that LORD had visited his people in giving them bread.

And she went forth out of the place where she was, and her two daughters-in-law with her, and they went on the way to return to the land of Judah.

And Naomi said to her two daughters-in-law, Go, return each of you to her mother's house. LORD deal kindly with you, as ye have dealt with the dead, and with me.