'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 the LORD had visited his people in giving them bread.

Wherefore 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 unto the land of Judah.

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